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p0303
1-3 of 3 Results
  1. OEM Issues
    Hey guys, got a 2007 Envoy with 203k miles. Just replaced the spark plugs about 3 months ago with AC Delhi recommended plugs. No issues since but the other day as I got to about 50 mph my check engine light came on and was flashing. Got home and pulled codes, got a P0303 for cylinder 3...
  2. Engine Tunes/Mods
    My 2003 TB all of the sudden started running bad at a stoplight. Check engine light flashed and then came on steady. Checked code when I arrived home. P0306, misfire cylinder 6. After going through the forum I decided to swap ignition coil 2 and 6 to see if the problem would move to cylinder 2...
  3. OEM Issues
    I have an 03 Trailblazer LS with 107,000 miles on it and yesterday one of the cylinders starts misfiring (blinking "Service engine soon" light). The truck struggles to idle properly and there is obvious hesitation during acceleration. This seems to start after it's been running for about 5...
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