Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi and thanks for the question! Can you tell me more in regards ***** ***** it runs rough? cold start, engine hot or all the time? Is the SES (service engine soon) light on steady or flashing?
Also, were any of the spark plugs oil fouled?
OK, good to know. The hesitation may lead us to a fuel issue. Have you checked the fuel filter? Checked for proper fuel pressure?
Unfortunately, no. A gauge is the only way to find accurate pressure. It should be approx. 55-60 psi.
Another issue that arises from time to time is sticking fuel injectors. Having them professionally cleaned can really help performance. This may also be the cause of the p0300 code if several injectors are sticking periodically. Good luck and let me know what you find if possible. I'd love to help further if needed.