Loudnproudford

I unplugged one at a time and they all changed the idle. What do I do now?

bigmikek

What does your truck idle at?

Loudnproudford

650 to 700

Yooper77

I'm having the same problem, only going down the road. Not trying to hijack your thread, but I need the same info. I'm going to end up doing the plugs and wires, just looking for good wires that don't break the bank.

Loudnproudford

Now I have a po171 code and service engine soon light, and still shuddering, any Ideas?

Old Red SCrew

I may have missed reading something but is this an engine shudder or transmission issue? Does the whole truck jerk around?

Loudnproudford

I believe it may be a engine issue

greenheadkiller98

My 98 did that. Fresh tranny fluid and filter took care of it

Old Red SCrew

Yeah mine jerked in overdrive pretty bad, tranny fluid flush/change and it ran fine

ibd2328

iTrader: (2)

It's really not a good idea to unplug coils or COP's while the engine is running. Buy a cheap DMM to test them or get a shop to plug it up to real-time data with the engine running.

A $20 Digital Multimeter can save you tons of hassle with nearly every electrical component on these trucks.