Need to check the fuel filter and run a fuel pressure test on the fuel pump first. I would give you the fuel pressure specs and tell you where the fuel filter is but you did not say what year are engine size it is. If you don't find your problem in this area, then ask your question again with all of the info. THANK YOU.
I was told it could be bad fuel pump.
NO. In the late month of 1999 chevy completely REDESIGNED EVERYTHING on the chevy trucks and nothing over the year of late 1999 will interchange with anything under the year of 1999. It wont fit.
wont kickdown into passing gear
Check your coolant. Is it thick and gunky?
Do you have automatic locking hubs on the front axles?
Bad temperature sending unit? Bad gauge?
Bad transmission? Bent shift linkage?
If so equipped catalytic converter may be plugged.
Check your crank shaft sensor
speed sensor
If you haven't changed the fuel filter and air filter, do so.
i had the same problem .. i got frion and put it in and it worked fine