i have a 1998 gmc jimmy 4.3L SLT (W) engine and i have a hesitation that i cant

[chaos]

track down? I have no DTC's at this time replaced the fuel filter , cap ,rotor, wires, plugs, tps, Egr,
this hesitation is only there after temp reaches 120.. from stand still stumbles bad..also slight stumbles when cursing at about 65 (no movement on tach stays steady).. also have code p0122 tps low voltage come up on occasion then go away..does anyone know what could cause this stumble.. have used every troubleshooting guide NO HELP.. so any gear heads out there that have come across this and solved it plz let me know..

 

[Tex G]

Repair the cause for the low volts. This could lead to not all the gas not being completely burned in the cylinder. The other cause is low compression in one of the cylinder. Run a compression check. Another item is the fuel pressure regulator. It could be to low to maintain the fuel needed.

 

[Molson02536]

track down? I have no DTC's at this time replaced the fuel filter , cap ,rotor, wires, plugs, tps, Egr,
this hesitation is only there after temp reaches 120.. from stand still stumbles bad..also slight stumbles when cursing at about 65 (no movement on tach stays steady).. also have code p0122 tps low voltage come up on occasion then go away..does anyone know what could cause this stumble.. have used every troubleshooting guide NO HELP.. so any gear heads out there that have come across this and solved it plz let me know..

Common for the fuel injector poppet nozzle to get dirty with carbon build up. There is really one way to have it cleaned but using a machine. Here is a link that should interest you. http://members.shaw.ca/betterthanyoutoo/Sticking Poppet.htm

The other thing you may want to do is to give your Jimmy a http://www.seafoamsales.com/ treatment. Good luck and keep us posted. Read this post and hope it helps. http://gmcowners.com/gmc-forum/showthread.php?t=13770