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Well actually in stainless it comes down to alloys. 400 series will rust like crazy but is designated as stainless. 304 and 316 less so. As I tell my customers. "It's stain LESS not stain proof". 🙂 I have had bumpers from Harrington on my daily driven 240 that spends a good deal of time outside for years and I have zero complaints. No rust and they shine up nicely.

It had nothing on the gauge at idle but it would come up with the RPMs. I got an N42 with internal oiling cam installed just about as soon as I got the car. The motor was needing a rebuild of everything so I got started on that pretty quick. I have one of those "change over" 280s. That odd N47 head and the sloped up rear deck. Oh yeah, I have the stuff to put together an E31 with a cut Nissan internal oiling cam and I'll use a spray bar. From all I read as long as I use a turbo pump it will be fine. The race guys did that back in the days. I run the turbo Melling pump on both my Zs now anyway. One has a spray bar and the other an oiling cam. The 240 with the spray bar pegs the oil pressure gauge when I'm driving. The 280 with the oiling cam just has good pressure.

Haha 😂 nah mate these will stay shiny till they go on the car! im sure one of the guys who have had these Bumpers on their cars for a while can comment on longevity of the shine nothing lasts forever, I anticipate these will need to get buffed to restore the shine but better that than the the fortune it costs to rechrome.

I bought a '76 that wouldn't go beyond idle. Spider web on the afm vane had it stuck. One of my all time lucky breaks. Probably none since then and that was '86, '87.

Another random thought. If the AFM is old the carbon trace could be bad. Maybe there's a certain point of the vane travel where the AFM sends bad data to the ECU. One of the AFM tests is to run it through its travel and watch resistance or voltage. Can't remember which. Found it. It's in the FSM but not the Guidebook. Page EF-51 in the 76 FSM. Edit - you can clean the trace with contact cleaner. Hose it down, move the vane. See what happens.

It's kind of funny how automotive mixes up so many different types of measurement, but you can calculate the fuel pressure drop from the intake manifold vacuum, and vice versa. A good running engine will have about 16 inches of vacuum at idle. Convert that to pressure and it tells you how much drop the FPR should cause. About 7.8 psi. 36.3 - 7.8 = 28.5 psi. 14 inches gives 29.4 psi. 32 psi correlates to 8.8 inches of vacuum. Not very good. Could be valves, timing, vacuum leaks. Just more clues to work with. https://help.summitracing.com/app/answers/detail/a_id/5306/~/engine-vacuum https://www.onlineconversion.com/pressure.htm

Siteunseen, great idea, I have a tube clamping visegrip pliers and will try that, that should eliminate a lower than normal fuel pressure issue. This is why forums like this are soo good for car owners.

Siteunseen, I have cleaned both set of points and checked their continuity, both are good. From what i have read the off idle should come off sooner than 2500. I have pulled the cover and can visually see that the idle points are open when the engine goes lean. I could bend the arm on the go rich (second set of points) and have it engage sooner but this was a running car in good condition when it was parked.

I agree with @siteunseen Quick, easy troubleshooting test: Unplug the Throttle Valve Switch and see if problem goes away.

I think the throttle switch comes off idle contact about 2500? It may need adjusting or cleaning of the contacts. https://www.atlanticz.ca/zclub/techtips/tps/index.html

I have always liked "nipple" talk. Thank you for the help again.

lol yeah. like chinese chrome...

True. I think it was a pace car? Found years later behind an outbuilding before it was restored.

The Camel GTU is not actually a race car. I have the order sheet from BSR to Tilton for the gnose and other parts.

Yes.. but there is stainless and there is stainless... In some conditions i have seen stainless that was rusty.. It all comes back to the word: Quality.. And i don't know but lately that is what is failing a lot of times..