If you can't duplicate the problem in t he shop its going to be tough to find. It could have been a fuel problem, or the ignition module. Even the new coil could be faulty.
if the inatake manifold was just replaced its possible there was a mistake made. if coolant filled the chamber again it would have died and not started up again until it dried up (the 2 day waiting period) its also possible the new intake gaskets caused a small rupture to the head gasket. check the oil and see if it has any coolant mixed with it. if it does it will look something like chocolate milk. also when it dies remove a spark plug crank the engine see if any water comes from the injector socket. do this for all plugs. if coolant comes out then you know which bank has the problem.
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SOURCE: 2001 gmc jimmy not starting
Did they do a fuel pressure pressure test to determine that its fuel pump? And if so what was the p.s.i.?It should be around 55 to 60 p.s.i. a few pounds under 55 p.s.i. Pump needs replaced, Your shop should have chk. this when it was there the first time. Did they by chance chg. the fuel filter, that can hinder it from starting too.
Testimonial: "it was the fuel pump thank you"
SOURCE: hi have 97 jimmy stalls when its cold&turn right..
Check the wire harness from the frame to the gas tank. Lots of road salt collect there and after a few years the conntction go bad.
SOURCE: stalled twice while towing at 65 mph. sputtered
If the scan will narrow down which o2 sensor it is and replace it. If it has more than one on that year that is. Under load you will probable have a richer fuel mix. If the sensor is going going bad it may only get out of spec reading under heavy load and warmer temps. I have had similar issues with GM and it was easily fixed.
SOURCE: 1996 gmc jimmy wont start seems like advanced
You said the problem happened right after the engine was replaced correct? If so bring number cylinder to top dead center on the compression stroke. Remove the distributor cap and see if the rotor is lined up with the number one spark plug wire. It's possible the distributor was installed 180 degrees out.
Just a thought,pull the dist.cap and make sure the rotor has
no side to side play ,thinking maybe a bad upper bushing in
the dist.Also,if the EGR valve has carbon and soot built up
on the piston it will make it idle really poor ,but run ok.
Might pull the EGR and clean it with intake cleaner.
Hope this helps.
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