rough idling

[edwadway]

Hello I’m from the South , I have an 1992 GMT400 / C1500 4.3 Liter V6
Automatic, I am having rough idle, I have replaced spark plugs and wires, ignition coil, rotor, distributor cap, the MAP , Throttle Position Sensor, EGR valve, EGR Solenoid, ETC Coolant Temperature sensor on intake manifold, IAC on Throttle body, still having mirrors shake at stop sign, run smooth when accelerating, but sitting at a light idling, runs bad, please help? Also changed the O2 Sensor, also replace Fuel pressure regulator, bought 2 Fuel injectors, but had one installed backwards, and need to correct it, not sure what else to do. Bought a Vapor vent valve, but don’t know where it goes.

 

[Dusdaddy]

Hello I’m from the South , I have an 1992 GMT400 / C1500 4.3 Liter V6
Automatic, I am having rough idle, I have replaced spark plugs and wires, ignition coil, rotor, distributor cap, the MAP , Throttle Position Sensor, EGR valve, EGR Solenoid, ETC Coolant Temperature sensor on intake manifold, IAC on Throttle body, still having mirrors shake at stop sign, run smooth when accelerating, but sitting at a light idling, runs bad, please help? Also changed the O2 Sensor, also replace Fuel pressure regulator, bought 2 Fuel injectors, but had one installed backwards, and need to correct it, not sure what else to do. Bought a Vapor vent valve, but don’t know where it goes.

Does it also occur when in neutral? Just want to rule out transmission.

 

[edwadway]

No

 

[Fightnfire]

Hmm, tough diagnosis. Have you checked everything for vacuum leaks? Timing?

 

[edwadway]

Hmm, tough diagnosis. Have you checked everything for vacuum leaks? Timing?

I have not check timing, plugs, wires, distributors cap, rotor and coil has been changed. I do have an injector dripping like it pouring water, I’m replacing it tomorrow, I had it installed backwards and probably damaged it, but now I have a replacement. I don’t know if That the issue?

 

[Fightnfire]

I have not check timing, plugs, wires, distributors cap, rotor and coil has been changed. I do have an injector dripping like it pouring water, I’m replacing it tomorrow, I had it installed backwards and probably damaged it, but now I have a replacement. I don’t know if That the issue?

That could very well be the issue I had assumed it was doing that before you installed it incorrectly.

 

[edwadway]

That could very well be the issue I had assumed it was doing that before you installed it incorrectly.

That correct, yes it was rough idling before I installed injectors and other items ,

 

[Fightnfire]

I would get the injector fixed then check vacuum and timing.

 

[edwadway]

I would get the injector fixed then check vacuum and timing.

Okay

 

[Saddle Tramp]

I;m so glad Fightnfire could help out. I had no clue at all and was going to suggest motor mounts in desperation.

 

[Dusdaddy]

Okay

Any luck on the diagnosis?