2003 Buick Park Ave, 3800 Series II motor, ~90k miles.
On my way home from work last night, I came to a stop near my house and I could feel the car running rough, like it was misfiring. Get to my driveway, continues to idle rough and sounds like its missing when I rev the motor. No service engine light. Go inside for a bit, checked the oil and it was low but above the fill line. Seems to be burning (or leaking) about a quart every 3k miles. I had to drive it someplace that night, so I get in and it starts rough and is still missing. Once I get going, it is either running fine or I can't tell its missing. About 5 minutes into my drive, I come to a stop again and it is fine. Has been fine since then.
I was thinking maybe it was bad gas, but would that cure itself? Was also thinking maybe a bad coil, but I how many misses do I need to get before the service engine light comes on? I do get a service engine light for P0442, small EVAP leak. I just turn it off and it stays off for about a month before coming back on. Could that be causing this problem? I last turned it off about 2 weeks ago.
The losing oil issue is also bothering me, I'm not sure if it is leaking or burning because I am also leaking PS fluid (probably a bad return line) so I can't really tell what fluids I am leaking. I just keep refilling the PS fluid till I get that fixed.
Any idea what could cause the car to run rough, then fix itself?
On my way home from work last night, I came to a stop near my house and I could feel the car running rough, like it was misfiring. Get to my driveway, continues to idle rough and sounds like its missing when I rev the motor. No service engine light. Go inside for a bit, checked the oil and it was low but above the fill line. Seems to be burning (or leaking) about a quart every 3k miles. I had to drive it someplace that night, so I get in and it starts rough and is still missing. Once I get going, it is either running fine or I can't tell its missing. About 5 minutes into my drive, I come to a stop again and it is fine. Has been fine since then.
I was thinking maybe it was bad gas, but would that cure itself? Was also thinking maybe a bad coil, but I how many misses do I need to get before the service engine light comes on? I do get a service engine light for P0442, small EVAP leak. I just turn it off and it stays off for about a month before coming back on. Could that be causing this problem? I last turned it off about 2 weeks ago.
The losing oil issue is also bothering me, I'm not sure if it is leaking or burning because I am also leaking PS fluid (probably a bad return line) so I can't really tell what fluids I am leaking. I just keep refilling the PS fluid till I get that fixed.
Any idea what could cause the car to run rough, then fix itself?
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