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Misfire 1.6 TS 2003 HELP!


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I just bought a Subaru Impreza 1.6TS from 2003 and i got problems.

I got some faultcodes: P1518 Starter Switch Circuit low input. P0302 Cylinder 2 Misfire Detected. 20B0 Preparatory codes.

Ive changed sparkplugs, coil and checked spark wires and they look ok. no vacuumleaks, compression is 9 bar at all cylinders and its running really rough. 

I can give 10% gas and it works normally, but when i give a little more gas it starts studdering and misfiring. 

Im at a little loss here. What can the problem be. 

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