Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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HMAC300
AUTOMOTIVE REPAIR CONTRIBUTOR
48,601 POSTS
you may have water intrusion toyour ecm. you can try putting dielectric grease on connection on pcm them reinstalling the connections that may fix it. or you may have a cracked coil which a pro should check out.