When it warms up it wont start unless I hold the peddle to the floor I change the map sensor out
Check for vacuum leaks ,check timing ,
SOURCE: 1989 truck stalls when hot.
Have you chg. fuel filter? If so, best to do a fuel pressure test, sometimes( not always) when the pump gets warmed up they can loose a little pressure and thats all it takes just a few # under recamended p.s.i and the truck quits running, you may hear the pump run but its not putting out the correct pressure until it cools down and it starts working again, but after a while quit all together.
SOURCE: 1994 GMC Jimmy hard to start and runs rough when first started
did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.
SOURCE: Truck wont start after it sits over night
Sounds like the fuel pressure regulator is leaking try and locate the fuel rail and find the regulator remove the vacuum hose and have some one turn the key on it leaks gas its bad. Note on some of the 4.3L engines the regulator in under the intake
SOURCE: Describe your trouble shooting 91 gmc truck
test fuel pressure by renting a fuel pressure test kit from schucks or auto zone then turn key on then off if it hits 50 psi it's ok if it drops below 20 psi in one minuter then fuel pump is bad. if it has throttle body injection then replace the injector or pull it apart to see if it is plugged.check oil pressuer switch behind the distributor to see if it is bad it will cause it not to run if defective.
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