Rough idle when cold

Hello,

Ok, when was last tune up? Worn Plugs, Corrossion on the Electrode in the Distributer Cap, Vacuum Leaks can all cause your problem.

Is the engine light on? I f so will need to pull codes.

1. Access the ECU and position it for observing the diodes.
2. If the engine does not run, turn the key on and proceed to step #4.
3. Start the engine and warm it to operating temperature then idle.
4. Turn the diagnostic mode selector on the ECU fully clockwise until both diodes flash 3 times then turn the selector fully counterclockwise. The ECCS system is now in mode

Post Codes for further info.

Ok, Sounds like you have a couple cylinders that aren't firing.
Loosen plug wires so you can pull them off fairly easy, start vehicle, and one at a time pull plug wires off noting any change in engine. Make note of any cylinder that does Not change engine rpm's.

Post findings

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Ok, the black smoke is an indication of the engine running rich(getting to much gas).

With the engine running and taking off one plug wire at a time paying close attention to how the engine responds each time you can narrow down which cylinder or cylinders are causing the problem. We can then proceed to determine the cause, whether it is electrical problem or mechanical.

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Hey, no problem.

Ok, lets back up a little. Reading back I had aked when the last tune up was? And you never answered.

If it has been a while pull a plug or 2 and look at the condition and also remove cap and take a look at the inside, especially the electrodes if they look like there's a lot of corrossion on them try cleaning them off a best you can and also clean off the tip of the rotor. Put back together and see what happens.

Check out the link below for Plug conditions....

https://www.2carpros.com/articles/how-to-change-spark-plugs

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Could be stuck injector or injectors. You said you had some of them replaced along with wiring. However, if the spark is not strong enough to completely burn the fuel that is sprayed into the cylinder you will get same results. Once engine heats up it will burn the fuel a little better do to engine temp, but when cold it won't burn as completely.

So, once again when was last tune-up?

I am trying to narrow it down but if you won't answer my questions back to you, it is pretty much impossible.

Ok, Possible causes.

TPS (Throttle Position Sensor)

IAC (Idle Air Control) Valve

Could be the recall item will take a look at recalls

Is engine light on? If so look at my first post above and pull codes, post them here.

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Sorry, but no it wouldn't I work 3 jobs. And am pretty busy. When I have a few minutes here and there I will get on here and answer questions. I receive notification that people have responded to question I have answered on my cell so I know that I need to respond back as soon as I can. And sometimes it will still take me 24 hours, do to my main job (EMT).

Ok, The TSB I believe you are talking about is for the Ignition Power Transistor Unit. It came out Oct. 1994 so I would think that the unit would have been replaced or caused problems before now.

I know you said the engine light isn't on but, see if by chance there are any codes in the computer memory.

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