what could it be

[`deelicious]

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[Guest kelvin6]

Did you do the easiest way to reset the ECU? Disconnect the battery and let it sit for a while (or turn the starter, press the brake pedal, any way to put a electrical load so that whatever residual power is left gets drained).

For most cars, reseting the ECU will wipe the Long Term Fuel Trim map. The LTFT map is the main fuel map for th ECU to determine performance and fuel economy on. When the data becomes corrupt or unstable (due to problems in the car), it can affect performance even when the problems are corrected. Clearing it will restore it back to factory defaults and the car may run rough for a short time. It will do this because it will have to adapt to your driving and readapt all the car's sensor signals.

This may not solve your jolt problem, but at least its worth a try as its a no cost fix.

[Guest aznfishyfart]

if ur gonna disconnect the battery

when u reconnect let the car sit idle for a good 10 minutes this will remove the roughness from the idle after the ecu is reset

[`deelicious]

The ECU was resetted a while ago. I shouldnt have to do it again but yeah, i guess it wouldnt hurt to reset it again. I just hope its not the transmisson.

[cksdayoff]

check the fuel tank sensor.

[cksdayoff]

what is the problem when certain driving conditions are accompanied by high ambient temperatures, the fuel tank ventilation valve may not remain fully closed. If this happens, liquid may enter the fuel tank venting system and migrate into the evaporation system,saturating the carbon canister. Should this occur while driving, the vehicle may experience performance issue ( i.e., vehicle jerking) and the malfunction indicator lamp (MIL) in the instrument cluster could illuminate. In rare cases, fuel could leak from the evaporation system leak detection pump filter. A fuel leak, in the presence of an ignition source, can lead to a vehicle fire.

could be this.