99 Tahoe giving me a beating

[smackleboom]

Hi all let me start by saying never in my life I thought a Chevy could defeat me:sad72: I bought a 99 Tahoe a few weeks ago because the owner could not get her to run properly. It would start and idle ok but touch the gas peddle and it bogs, backfires,and barely goes above 1500 rpms.i read through these forums for a few days then I attacked. So far the previous owner had put in a new distributor with cap and rotor and a new fuel pressure regulator. I have put in fuel filter, spark plugs,front O2 sensors,new timing chain and gears, intake gasket,and did the camshaft retard to 0% at 1000 rpms. I'm using a Genisis Newvo scan tool, I have no CEL but a p0154 and p0300 is pending. I am almost 100% sure that I don't have any vacuum leaks. My only discrepancy is that the fuel pressure is at 52-59lbs (with new regulator being verified) and the previous owner had the cats gutted.othewise all of my engine sensors have normal readings. That being said ....I'm convinced that what I did,needed to be done I don't want to randomly throw parts at her so I'm crying for help even though it's better in the Bahamas......parts ain't cheap

 

[Kevtahoe]

Have you verified the timing is not 180 degrees off?

 

[MO Viet Vet]

Would never start 180 degrees off. Clean the throttle body.

 

[remauto1187]

This has the 5.7L right? Check the timing on the distributor! It is impossible to install the distributor without a scanner that shows the actual timing counts. The engine will not even start if the distributor is not locked down within 10 counts(I believe thats what he units of measure is). The distributor is locked down at 0. The computer controls the spark advance. This is the problem I ran into on a 99 Sierra Vin R 5.7L that I had to change the intake out on. Still have the truck with 265K on the clock.