2008 chevy silverado 2500 hd - truck will crank, but not start. this goes on for a few minutes then starts. 1st time i used the remote starter and it started immediately (3 wks ago).
yesterday, after car wash, it did the same thing, but remote starter would not help. after 5 minutes of trying, it finally started. BUT idled at 3000 rpm. after putting in gear, slowly dropped to the normal 600 rpm. no issues today.