Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
cycle the fuel pump and watch for the pressure to drop on the guage , does it seem to go to 62 and stay there or does it drop off, this would be alot easier if you had access to the engine date in the pcm , but since we dont , if you have intermittent spark that could be a sign of a crank sensor issue but you wont have injector pulse either, have you tried a ignition module yet and check the connector on that, its located right next to the coil .
well if the ignition module ls failing then it could cause a loss of spark or improper spark , since you've had problems with the crank sensor hows the wiring down there, if the terminal tension is loose then moisture will effect the sensor, same with the ignition module , without the proper tools to check terminal tension its hard to do but use a small paper clip and see if the drag of pulling it out is the same on all terminals , its very unlikely that it is a mechanical issue so don't pull anything apart just yet , check these things as best as you can and let me know
not a problem . hope you find an issue that may have been over looked,
I just recently purchased a 2004 Tahoe with 155000 miles