1995 Tahoe Running Rough

[lsx_mustang]

I have a 95 Tahoe I just put a new Edelblock intake, rebuilt tbi heads, throttle body spacer and rebuilt throttle body on it with a few mods done to it. It was running rough before all of this was done cause I had a blown intake gasket on the original intake.

Its only run rough at night now when I'm coming home from work but not when I go into work during the afternoon. The idle goes up and down when it stop at a light or stop sign, when I'm driving it down the road the RPM are sticking then it just jump up in the RPM then drop. I have gotten the truck scanned and nothing is showing up and everything is working fine.

I need some advice so I can try to fix this problem. Thanks in advance.

 

[Slammed]

Throttle position sensor?

 

[lsx_mustang]

Replaced it, also replace the Egr and Idle air

 

[Slammed]

Injectors , cap n rotor, wires?

 

[lsx_mustang]

Injectors are working good and the fuel psi is at 11-1/2. It has a brand new dissy, new coil, PVC valve, wires, plugs, timing is dead on.

 

[lwcools]

double check the gap on the plugs. I had the same issues on a stock engine and found the gaps were the culprit. I've seen some others posting about plug gap issues in the past, I'll see if I can track some of those down and post the links

 

[lesterl]

What brand of EGR Did you use? I would use a blockoff plate to block off/ remove the EGR and see how it runs....

 

[Slammed]

11psi? Mines 60psi

 

[lesterl]

Slammed, yours isnt TBI, 11-12psi is normal...

 

[Slammed]

Slammed, yours isnt TBI, 11-12psi is normal...

Really? .... Oops right just did my spider injectors my mistake

 

[lsx_mustang]

I'm using a BWD EGR Valve from Advanced Auto

 

[lesterl]

That would probably be your problem then...... bad idle hesitation on acceleration?

 

[lsx_mustang]

yes and some time when stopping

 

[lesterl]

That would be the EGR...... ANY other than OEM (AC Delco/ Delphi) are gonna suck....

 

[lsx_mustang]

I'm just going to block it off and see what happens

 

[lesterl]

It will run better with the block off plate........ TBI's also have a tendancy to suck the base gasket in and will sometimes set a code 32.....