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brownjeff, ASE Certified Technician
Category: Jeep
Satisfied Customers: 13886
Experience:  17 years experience, ASE certified, dealership certified, Service Manager for 15 years,
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1999 jeep wrangler 4.0 p0301 code.# 1 misfire is coming up

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1999 jeep wrangler 4.0 p0301 code.# XXXXX misfire is coming up but i changed plugs,wires,cap,rotor,coil and still there.
Check the compression of the engine to make sure mechanically the engine is in good condition and if so then replace the injector as it can also cause the vehicle to misfire and based on what you have replaced is most likely the cause.
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