A Friend brought me his early '90s olds regency with the 3800. It seemed
to have a decent miss at idle which was tracked to the #1 injector. When I
unplugged the injector(engine running) it didn't change the idle. Also, when
going down the road, the car would shutter fairly severe under light to
light/med acceleration. When you give it med and up throttle, it would take
off smooth as silk, and fairly powerfully too.

   I replaced the injectors...Idles great. Took it for a test drive and was
awesome under all throttle. Gave the car back and it started doing the
shutter again after a long drive. A mechanic Friend of mine thought it might
be a trans shutter and did a filter and flush before I got it. It didn't
help!

Possibly-

   Plug wire?

   Injector plug/harness?

   Trans pressure?

   Coil?

   Coil plate?

   ??? ??? ????

   Any and all ideas would be GREATLY appreciated!