2001 Bravada Hesitates

It runs great until it gets to operating temp then it starts to hesitate when starting out or going up a hill. It gets worse when I pull my trailor. So far I have put in Fuel Pump & Filter, New Plugs, Cap, Rotor, Wires, O2 Sensor, Cleaned the EGR Valve and put a screen under it, and new PVC valve. I have a lawn care business and need my truck daily. If anyone has any other Ideas I would greatly appreciate it. Oh, Yea! I also looked at the exhaust manifold and did not see any cracks that might leak air in and mess with the O2 sensors.

I was curious if you solved your problem yet, I'm having the same trouble with my '92 which is a 4.3 . It runs fine till it warms up then it wants to die at times. wait a few seconds and it cranks right back up and runs fine for a short while.

Ken wrote:

It runs great until it gets to operating temp then it starts to hesitate when starting out or going up a hill. It gets worse when I pull my trailor. So far I have put in Fuel Pump & Filter, New Plugs, Cap, Rotor, Wires, O2 Sensor, Cleaned the EGR Valve and put a screen under it, and new PVC valve. I have a lawn care business and need my truck daily. If anyone has any other Ideas I would greatly appreciate it. Oh, Yea! I also looked at the exhaust manifold and did not see any cracks that might leak air in and mess with the O2 sensors.

When I first start my Bravada in the morning it hesitates for the first block or two. It is like its starving for gas. After two blocks it runs fine. could this be the fuel pump or filter?