Code P303, And also P300
#1
Code P303, And also P300
Hello, I am new to the forum, I have active code PO303 and PO300, I have changed all plugs and wires, new coil, cleaned out the throttle body, also replaced the intake orings and R&R THE PCV. The engine was running rough before the CEL came on for a while. I originally had a intake leak at the #1 intake, which I diagnosed with spraying brake cleaner around the intake manifold, I heard the engine idle change and could visually see the cleaner get sucked in, so like I said I replaced all of the intake orings then I get this CEL for the #3 misfire, and random misfire. I have taken the manifold back out and rechecked my work, I didn't clean the ports at first, so I did it this time but it still has that code and sounds like a helicopter at idle, I have not done a compression check yet because the engine is not knocking, nor is it burning oil, I do however have small amount of oil in the throttle body hose. Any suggestions? Thanks for your time.