The Beast Background info: She is a 2002 Grand Prix GT with a mere 165,000 miles. In the past year I have replaced: Water Pump, Upper and Lower Intake Manifold Gaskets, Belt, MAP Sensor, Throttle Position Sensor, catalytic converter, Thermostat.
I was on home from work yesterday she was running perfect. I was low on gas but I decided to wait it out and made it home. This morning I was on my way to work to get gas and all of a sudden she started running horrible and the check engine light was flashing. I figured she was choking on fumes. I rolled into the gas station and put 16.3 gallons of regular gas in her. Fired her up and low and behold she was still running like ****. I went back to my apartment, I noticed a little bit of white smoke and a bad smell. I went auto zone they scanned for codes and found a p0300 random misfire, and p0135 oxygen sensor.
It is running about as bad as it did when the cat clogged up except when that cat clogged it gradually got worse, this time it just all of a sudden went to ****. It's like she idles ruff and keeps running ruff through all the RMPs. She feels weak when accelerating. The SES light flashes. I drove it to auto zone and was getting terrible gas mileage averaged 11 mpg on 7 mile round trip according to the digital read out.
Could a clogged fuel filter make it start running this ruff all of a sudden? I bought a new one but I can't seem to get the old one off.
My other thought was a vacuum leak but I can't find one.
The guy at auto zone thought the upper intake manifold may be leaking fluid into the cylinders. I took the throttle body off and didn't notice any damage. Was I looking in the right place?
Replace the 02 sensor no more PO135 still getting the p0300 though, and it is still running like a turd.
No signs of a blown head gasket. Oil and Water are clean.
