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How does it idle in park , does it run ruff or smooth? Are any lights lit on the dash , check engine etc. ? Could have a partially plugged IAC air passage .idle air control (IAC) valve ! The engine computer uses the IAC to control idle , when under a load such as when put into gear the computer raises the idle ! It does this by allowing more air to by pass the closed throttle into the engine raising the idle ! If these air passages clog they restrict the air flow an cause a idle problem ! Now if it runs ruff at idle in park you could have vacuum leak ! Rough Idle How to Fix Ford Taurus Engine Stalls at Stop Signs
I had an 88 that did something like that, it would idle up and down it seemed to be worse when the engine was cold. It turned out to be the MAP sensor, I never did get a check engine light. A friend of mine had the same truck and we swaped sensors back and forth until we found the problem.
When you start your car, you step on the gas and turn the key, you have set the high idle feature on the carb as part of the warmup sequence. When you step on the gas again, you kick high idle off ...if premature, the engine is cold and it runs ruff, and wikll likely stall under some circumstances until you have reached operating temp. The reason for the ruffness ...is gasoline becomes 'gas' better when the engine is at operating temp than when the engine is cold.
Your battery is getting tired. When you step on the gas and the lights get brighter, it is because you are running the alternator at a higher speed and you are making more electricity which the lights are more than happy to gobble up.
Keep in mind your car is notonly a Caprice Classic ... it is a classic, 26 year old vehicle. It needs a little more TLC than a newer model.