[Jrs3800]

I just want to make a small remark here.....

This is very common on all of the GM 3800 Engines... These all use a Waste Spark System... If one of the Plugs is bad or pissed, or you have a bad wire this will affect the operation of the opposing cylinder due to the resistance in the wire...

2 plugs are fired at once, one on the compression stroke( takes more power to fire the plug ), and the other on the exhaust stroke( takes less power to fire the plug )... Imagine if there is a problem in the way the system operates... You will end up with a Miss under load, and the other cylinder won't be firing as good as it should, so the car will become weak...

a lot of people assume its a trans issues... If you have a 3800 and the plugs and wires have never been replaced and are worn you want to take care of this first to rule them out... All 3800's will have this issue somewhere along the line...

Also just as fair warning, Do Not Use BOSCH PLATINUM plugs in a GM waste spark system...