Hello all, could use some help! If I cant find an answer or possible fix I will take it to local dealer. Hopefully they can diagnose without codes, but at $130 an hour hope its found out quick. I can fix with the help of a mechanic friend. 2006 RTL, 160,000 miles. Started it the other day and had check engine and vtm4 lights came on and idle was chugging. Had codes read, cylinder 1&3 misfire, and multiple misfires. Replaced all 6 coils and plugs. Still had rough idle but no chugging and no codes. I've noticed if I turn ignition to on and wait 5 seconds its starts and idles fine. Help!