I recently purchased a 2003 Chevy Venture. I have replaced several parts including the MAF sensor, TPS, air filter, fuel filter, and several other items. However, the van seems to have an electrical issue. It hesitates and bucks when you give it too much gas. It only happens at 3500 RPM at around 20 mph and 50 mph. Sometimes when this happens and you try to give it gas it will not even accelerate. This happens in park and neutral as well. Although if you drive the van slow and don't give it too much throttle it passes right through these areas. Very confusing! I have tested the fuel pressure and it is fine. Tested the engine coils and they are fine. So it leads me to believe this is some sort of an electrical issue somewhere. It has been really challenging figuring this out. Any advice would be greatly appreciated. Thanks in advance!

 

Did you ever get to the bottom of your problem?

 

I did eventually figure out what was the issue. I changed the 2 crank sensors (7x - on the back of the engine and 24x - under the harmonic balancer) and that fixed the issue. Hopefully, this helps someone else out there.