mine was doing the same when i bought it. I replaced the MAF (2 screws and a plug) 1 minute job and it worked perfectly. take the negative battery cable off, replace MAF, connect battery, make sure a/c..radio is off, start car and wait for the radiator fans to kick on 3 times before driving. (car may not want to start or bog/die on first couple trys after MAF replacement) this is normal as the ECU is in learning mode. do not rev engine, just keep starting it until it idles on its own.