Help. Chasing a hesitation issue

[Matt Conner]

Keep plugging away at it, fix the cheap stuff 1st. Then see what happens. There's an old saying - after you eliminate all possibilities whatever remains, no matter how improbable, must be the solution.

Changing the filter didn’t help any, it seems like it’s slowly getting worse and worse


Sent from my iPhone using Tapatalk

 

[Matt Conner]

Keep plugging away at it, fix the cheap stuff 1st. Then see what happens. There's an old saying - after you eliminate all possibilities whatever remains, no matter how improbable, must be the solution.

So I ran into Somthing, I missed a small vacuum leak going from the Tb to the MAP sensor, so I put a new hose on it and it seems to be running better

 

[Matt Conner]

I pulled the egr and tested it with a vacuum pump, it is indeed bad, it will not hold any vacuum, it leaks down immediately

 

[Matt Conner]

I pulled the egr and tested it with a vacuum pump, it is indeed bad, it will not hold any vacuum, it leaks down immediately

I hope that is the source of my problem

 

[PlayingWithTBI]

I hope that is the source of my problem

^^^ X2

Keep plugging away at it. It's surprising what you may find.

 

[Dafizuck]

I had a similar issue with intermittent stutter.... had an injector going bad. Swapped the electrical from one injector to the other to ensure it was the injector and not the wiring.

 

[Ironjet]

I saw it mentioned earlier, check your fuel pressure. I had a pump that was putting out only 4 psi. the truck ran but not well
I chased every sensor and replaced all ignition parts only to get no where

Also, a tbi gasket set with new regulator is only about $25 cheap and easy to replace

 

[Trlrider]

Just had a customers 1995 doing what you describe. New cap, rotor, plugs, wires, and fuel filter since they had not changed. Fact the wires looked like the factory originals with 195K on the clock and the electrode on the plugs were about half what they should have been.
Still bogged. Since idle was screwy also pulled the IAC and found severe buildup in the port and the tip worn badly, replace it.
When checking the timing found it was not reacting properly, in the end a new timing module in the distro fixed the issue.

 

[Matt Conner]

Turns out that hesitation was a manifold leak at the head. Replaced gaskets. Problem solved

 

[1997]

great you got it sorted.