1999 Lumina 3.1 liter V6 - 150,000 miles
Hey, i have a problem with the car but only when it heats up. It runs fine while its cool, but after it warms up, the car stutters and stalls, its hard to make it up a hill. Brought it into a shop and had several readings but it couldnt find anything. The CEL isnt on either.
The dealership doesnt know, a mechanic doesnt know. We changed the MAF sensor but that wasnt the problem. the spark plugs are about 6 mos. old.
The problem occurs ONLY when its heated up. also, i dont know if this is wrong or not, but on the temp gauge, it doesnt go half way... i dont know if thats normal or not. it stops at a little over a quarter. maybe about 130 degrees? half looks like 180.
When i come to a complete stop, sometimes it will just stall.
When i go up a hill it shakes and sputters and that also happens when i push on the gas a little more.
If anyone can help you'd be smarter then a dealership. if you need to know more specifics ill tell you.
thank you.
