My 76 z was running ok when I bought it 5 months ago but since then it started acting weired. At first the car will start then when it warm up and I shut it off for 15min then the car will be hard to start and sometime it wont start. The car is stock. I changed the ignition wires and coil but it still the same. I checks for fuels and sparks their both ok. I didn't change the spark plug but I think it still ok. Any suggestion?

Is it flooding itself out? When you kill it does it deisel?

How do you know the fuel pump is putting out enough fuel, maybe a filter is clogging up? Also have you checked the state of the rotor inside the distributor? May be you are not getting enough spark.

I had put in a new rotor and ignition wires. Today I check the spark plug and find out that there sparks after the coil. There also spark after the disturbitor. But when I hook up the spark plug there no spark. When I put the spark plug next to the body the spark will jump but if I pull the plug away from the body I do not see the spark jump thru the spark plug gap. Could it be that my spark plug are bad?

Today I took out the spark plug and it turn out that 4 sparks were out. Now my z is working ok. but I still have a problem when it warn up and then I turn it off for 15min. When I try to started it up the Idle would be at 500 and it seem like it gotta die.

Any suggestion?