My 1990 chevrolet lumina 3.1 eurosport dies when i give it gas.
I have changed map sensor and fuel pressure regulator. My car will start and idle if i pump the gas before i start it otherwise it wont start. but when its idleing if i give it any gas at all it dies. Dont have any idea what it could be now.
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have you replaced the map sensor or try unplugging the map sensor and see what it does also check the vacume hose or conection to the map sensor also try unpugging the throtle position sensor with either one unpugged you wont be able to drive it but you can see what it does parked
Items you should check are the EGR valve, unplug the electrial connector, which will disable it and see what happens. The other is the fuel pressure regulator, the best way is a pressure gage. You can also do a basic check by finding the RETURN line and crimp the rubber part closed with a suitable tool that won't damage it [ a pair of needle nose visegrips with some fuel line over the prongs works ], If it takes gas- then the regulator is faulty and needs to be replaced.
I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?
Coils and wires are the most likely culprits as they never get replaced hardly ever. You cant really test a coil, you can check for resistance on the plug wires but that doesnt tell you if the insulation is bad on them.
use a scanner sound like a bad sensor .mass air flow - map sensor - coolant sensor. check vacuum line to fuel pressure regulator if wet with gas replace fuel pressure regulator. make sure yours spark pluge the right heat range. also change air filter. check charcoal canister. check oxygen sensor and egr valve. make sure its not stuck open.