Join Date: Aug 2009
Location: Cleveland, OH
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Does it only happen when the car is at full temp? What kind of coils did you buy? Delcos or another OEM brand?
I feel your pain. I've been going through a similar situation myself in my 2003 3.4. Jerky, like the trans is acting up, but only at full temp. No check engine light, just an annoying, intermittent, seemingly harmless but still very aggravating jerk/hesitation on slight throttle when cruising. Comes and goes like the wind. Goes away when you give it more gas.
I've been chasing this ghost for a long time, at least a year maybe longer.
Long story short, I've been running two original factory coils on an engine w/188K, and one aftermarket OEM BWD coil. After doing a lot of what you've tried, (new plugs, new wires, new fuel filter, etc), I broke down and got three brand new AC Delco coils, and put them on last night. I am waiting to see if it goes away, it hasn't come back yet after a couple trips, but I'm still not positive the issue went away yet.
I've been reading some other forums, and many other makes/models have had DIS coil issues, but no check engine light since the problem isn't severe enough to exceed misfire counting in the PCM. It's almost like a bad coil won't throw a pending code or anything unless it's 110% fried up.
I will let you know if that helps me, not saying it will fix your issue, but it sounds like we're having similar problems.