I went to pass somone today, and the car wouldn't go over 4k rpm, and something started making a stumbling noise. If I drive normally, everything is fine. When I give it WOT, the problem occurs. I got home and made a video of the problem, just as I was hitting the stop button, the SES light started blinking with the following codes.



The video of what happens can be seen here.

http://s77.photobucket.com/albums/j7...t=stuff018.flv

Whats the cause of the codes and problem??????

just so nobody else has to search

DTC P0300 Engine Misfire Detected
DTC P0463 Fuel Level Sensor Circuit High Voltage
DTC P1811 Maximum Adapt and Long Shift

Great, time to trade it in

Have you replaced your LIM gasket? Losing any coolant?

Had the upper and lower IM gaskets done as well as both valve covers as well last year when I bought the car. I'm not leaking any fluids. There were no signs of any kind of problems before yesterday when I went to pass someone. It only does it under WOT, the transmission shifts nice and smooth during normal driving. I wonder if the Intense PCM is the problem?

OK, wanted to check on the intakes, as it sounded like when Brianj'* intake went. Along with the plugs and wires, check the vacuum hoses, also. Pay particular attention to the T under the supercharger snout, and the capped off fitting on the multi vacuum port on the supercharger.

Would the transmission slipping/not shifting cause the misfiring? I changed the plugs and wires last June. I may do them again just to see if the problem goes away. The P0300 code could be due to:

* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(*)
* Faulty fuel injector(*)
* Burned exhaust valve
* Faulty catalytic converter(*)(smells like eggs)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer (last reseort

The car has numerous little issues like the non working gas gauge, constant water leaks, etc, that all add up and I'm still thinking about trading it now before things get worse.

OK, I went out and bought a set of NGK TR55ix plugs (Ihave the regular tr55'* now) and Belden wires from NAPA. I will be replacing them tomorrow. Would a misfire cause the trans code? How do I tell if the catalytic converter is causing it? I had that replaced under warranty lat year too. This sucks, the car fine under normal conditions. Thanks.........