have been reading some threads regarding p0505 (idle control system malfunction) and just want to know if anyone can help me with my issue. my car jolts sometimes after i let off the gas, especially at higher velocities. i don't know exactly what to do, but would welcome any and all advice in this matter. my cel is on, and the readout said it is a p0505. i will do whatever i need to fix the problem, and i'm just hoping someone can help. i know a little about cars, but not much. please help me....thanks in advance!