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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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CI have a 03 chevy suburban and its showing a p0300 code,

Customer Question

cI have a 03 chevy suburban and its showing a p0300 code, random misfire and it had a lot of gas in the oil and runs really rough. what do I need to check to fix this problem?
Submitted: 1 year ago.
Category: Chevy
Expert:  Roy replied 1 year ago.

good afternoon my name is ***** ***** I will assist

the most common issue for the 300 miss fire code is fuel pressure too low. it needs to be checked to verify. you can rent a tester at a parts store is you do not have one.

the gas in the oil may also indicate that an injector may be leaking and dripping into the oil.

first, I would check the fuel pressure