2002 Chevrolet Truck Obd2 Code Reading Po300 Engine Lope On 3 And 4

2002 CHEVROLET TRUCK
150,000 MILES
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SUNNYLEXUS
  • MEMBER
  • 1 POST
obd2 code reading po300. engine lope on #3&4 cyclinders. change spark pluges-coil-injecters and wires.
Jan 20, 2013 at 9:01 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check your fuel pressure it should be 60-66 psi at rail with key on if a small block. if big block 54-62 psi if pressure ok check for vacuum leak with choke spray
Jan 20, 2013 at 10:05 AM
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