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I have a 1999 Buick Century and when I start the car and begin to drive, it runs and idles fine. But about 5 minutes into my drive, when I begin to accelerate it stumbles really bad, causing the car to jerk. It hahas done this in the past, but after letting it sit for a day, it runs fine and acts completely normal. This happened about a month ago, and today it started to do it again. At first I thought it was the fuel pump, but if it was the pump I believe it would fail completely, not work then work again for a long period of time. My guess is coil or possibly plug wire, but I’m not sure and I wanted to seek your guys’ opinion. Let me know -Mike
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No check engine light on? see if this helps.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
I forgot to mention that there is a check engine light on…strangely enough it goes on and off and is on sometimes when this problem isn’t occurring.
my recommendation is too plug a scan tool in see what codes you get, and if you have questions about what the codes mean we can tell you and help you narrow things down.
on a side note…
a maltitude of things can cause missfires in the 3100 SFI from plugs and wires, too bad sensors and a lower intake manifold gasket leak. my first car was a 2000 buick century custom, the car had slight misses and stumbles at a steady cruse once warmed up and very occasional, i parked it into the shop at school too check it and the next thing i know its puddling coolant on the ground, right from the lower intake manifold gasket, a common issue for the 3100 SFI, and it can cause slight missfires if the lower intake manifold gasket leaks, now it would be wise not too make that assumption but its one of the small possibilities.I’ve had a suspicion that this car has a failing lower intake manifold gasket for quite some time, but i was never completely sure. Another oddity is that when this problem occurs, if you park the car and let it get hot and idle for 20 min, the problem goes away. I’ll go down later today and see what codes come up.
follow up with collage man and my recommendations and we will figure this out, the 3100 is a simple enough engine to figure out, plus like i said i owned a car with one, and have replaced the intake manifold gasket myself, if you want to do that i can help you a little, if your car has over 150,000 miles and its starting to get damp around the gasket, i would suggest replacing it because that car is about 16 years old now, sometimes they leak into the engine, and mix coolant with the oil, then pit and score your bearings, and that can be a very bad day, luckly for me it was a external leak on mine, and i was able to catch it before the car over heated, i was lucky.
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