I have a 2003 monte carlo; it was running great until recently; i noticed that the car began to surge while driving like it was accelerating on it's own; when i got home and put it in park, the idol was very high (1800 - 3000); my neighbor hooked up an OBD ll and tried to scan it but wasn't able to run a scan; it stated also that it the car had history of any codes; we ended up just re-setting it by removing ground cable from battery - which we know isn't the solution, but this time it brought back to a normal idol; but now it started happening again with a high idol in park; so i tried it again but the idol is still high