Postby sleeper187 » Mon Mar 05, 2018 1:18 am
sounds like a vacuum leak to me. we were replacing a part on my 05 and forgot to replace a vacuum line. when we started the engine, it had a high idle of about 1500 for 15 seconds, then would drop to 1000..after another 15 seconds or so, it would jump back to 1500. initially thought it was the throttle position sensor going bad. there were no codes thrown with that vacuum leak for the 5 minutes we had it running.