Have a '87 Regal Limited Turbo, with the following symptoms:
1. Car starts fine, but initial idle is kind of rough/skippy. When I shift from park to reverse to back out of the garage, engine almost dies, sometimes it does die/stall.
2. When driving shortly after start-up (engine not fully warmed up) I get hesitation upon acceleration. The whole engine kind of stutters, and then it catches and accelerates like normal.
3. Seems like when I drive the car at constant speed on a very flat, smooth road, it feels like the car is cutting out VERY slightly . . . almost imperceptible.
4. Once car is warmed up, I don't seem to have the hesitation problem, or not nearly as often or as bad.
5. I have run an older version of Turbolink, but nothing shows up as an error code.
6. IAC and TPS tuned to show up within proper range on Turbolink . . . not sure that this would be a cause, but this seems like a "baseline" kind of check from what I've read on this site.
7. Had a mechanic diagnose the hesitation problem, and they tried replacing the spark plugs (commented that the Bosch platinums that the car came with when I bought it were problem-prone). The mechanic also commented that the plug from cylinder #6 showed signs of incomplete combustion (as evidenced by the color of deposits on the plug).
Does this hesitation sound like a familiar problem to anyone? I'm wondering if this is a coil problem (mechanic suggested this as a next step if the spark plug replacement didn't solve the problem . . . and they haven't). Mechanic tested the coil and said it "checked out", but I'm not sure how hard they looked at this. Does this sound like a coil problem to anyone?
I relize this diagnosis over the internet is probably a bit of a stretch, but I'm just wondering if this mechanic is headed in the right direction here. I don't want go through a bunch of expensive parts based on a mis-diagnosed problem.
Thanks for your input!
Sounds like it could be a dirty IAC. Take it apart and clean it with carb cleaner. Your idle may be a little low too???? Always check your grounds on the back side of the pass head when anything goes wrong. They can be greasy or corroded. Either is not good.
Can you give us a better location on the ground Wire ?