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Originally Posted by vjp64
When driving on slight incline with steady throttle between 50 and 65 mph Have shudder, let up or increase gas lightly, shudder goes away. had Dealer look at it four times. They can't find the problem. I heard it might be a PCS (pressure control solenoid). Or PCM (powertrain control module) Feels like car is skipping or missfiring ,but checked all electrical and plugs wire, etc...
Any Ideas out there?
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Try changing the spark plugs. We had this same problem on our 1999 Buick Regal. It started when the car was fairly new and then kept getting worse over the years. The local dealership and our local mechanic couldn't figure it out. At 80,000 miles I decided to try something myself and changed out the spark plugs. The plugs were supposed to be gapped at .060". One plug was gapped at .068". It looked awful. It came from the factory this way. I haven't had the problem since.