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I DONT KNOW WHAT ELSE TO DO. I DID A COMPRESION CHECK #1CYL 145 #2 150 #3 150 #4 150.... im NOT SURE WHAT CODE P0301 IS BUT IM GUESSING LOW COMPRESSION IN CYCLINDER ONE.... i REPLACED ALL THE SPARK PLUG WIRES. AND EVEN PUT NEW INJECTORS IN AND STILL GET MY CHECK ENGIN LIGHT ALSO PUT A NEW CAP ON. aND CHECKED FOR ANY VACUME LEAKS NOTHING..... i ALSO RESET THE COMPUTER IT RUNS PERFECT FOR 100 MILES AND THEN THE CHECK ENGINE LIGHT COMES BACK AGAIN AND RUNS LIKE CRAP.
 

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http://www.obd-codes.com/p0301

A code P0301 may mean that one or more of the following has happened:

* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer
 
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