help please guys 94 gmc jimmy

[bigsmith96]

hey guys having a little problem with my 94 gmc jimmy 4x4 vin w 4.3 (cpi) it has a slight miss at idle and runs fine as soon as u hit the throttle and it runs good and has plenty of power when u stand in it and in mid rang it has no power and u can feel it kinda missing/bucking any ideas ? my fuel pressure key on eng off is around 62psi and 56 psi eng running. it has a cold air intake.my avg mpg is around 10.4mpg with 31/10.50/15 mud terrains
new parts in the last 300 miles...
new fuel pump
new fuel pressure reg
new fuel filter
new fuel line nut kit
new spark plugs and wires
new tps sensor
new starter
new temp sesor
new temp sender
new des cap
new rotor button
new pletum gasket
new catalytic converter
I love the truck just tired of dumping 100$ bills down a wishing well please help me out guys

 

[bigsmith96]

Grrrrrr

This many people and not one person has had this problam or ha no idea what it be

 

[bigsmith96]

Anyone

Any one have a idea ?

 

[Tomhannock]

Maybe try cleaning the throttle body out with carb cleaner.. An the mass air flow sensor with mass air sensor cleaner.. I've also seen people do a intake cleaning by slowly pouring sea foam into the throttle body while it's running... Don't do that in a garage though it makes lots of smoke out of the exhaust...

 

[Molson02536]

hey guys having a little problem with my 94 gmc jimmy 4x4 vin w 4.3 (cpi) it has a slight miss at idle and runs fine as soon as u hit the throttle and it runs good and has plenty of power when u stand in it and in mid rang it has no power and u can feel it kinda missing/bucking any ideas ? my fuel pressure key on eng off is around 62psi and 56 psi eng running. it has a cold air intake.my avg mpg is around 10.4mpg with 31/10.50/15 mud terrains
new parts in the last 300 miles...
new fuel pump
new fuel pressure reg
new fuel filter
new fuel line nut kit
new spark plugs and wires
new tps sensor
new starter
new temp sesor
new temp sender
new des cap
new rotor button
new pletum gasket
new catalytic converter
I love the truck just tired of dumping 100$ bills down a wishing well please help me out guys

Start with the simple and inspect your EGR valve and the vacuum lines to it and the rest of the vacuum lines. Replace anything that looks damaged from carbon in the EGR and any vacuum lines that are cracked or to soft and the lines maybe collapsing under negative pressure...

Good luck and keep us posted..
Molson02536

 

[EMFI2R]

Hi, New member here.

I read the same problem, same yr/model in another forum today. He had the OBD1 error code 35. He swapping tons of stuff and sprayed carburetor cleaner everywhere on vacuum hoses (a leaky vacuum hose sucks in the flammable cleaner and makes the engine rev up).

He finally looked inside the throttle body when cleaning it off and discovered the gasket was falling apart, actually sticking in the way of the injector!

Check that Throttle-Body Gasket. Good luck!