P0300 code comes and goes

2-3 years ago, I had a bunch of codes come up, and the main codes seemed to be O2 sensor codes. After I got a proper service CD for the car, it turns out that when these codes come up, instead. OBD2-OBDII Codes Definitions, Description and Repair Information. Diagnose and Repair Engine Light Codes, Transmission and Body Codes Engine-Codes.com. 31,179. 31. 129. Jun 13, 2006. 3. This is on your &x27;95 It looks like an OBD-II code. OBD-II cars have an EVAP monitor and when a code like that comes up, the gas cap is the FIRST place to look. The system is closed and a bad seal on the cap (like it isnt tightened down all the way) will open the system and the monitor picks up the pressure delta. 9ltr when cold I have a misfire check engine light comes on code read P0305 meaning 5 cylinder misfire, BUT once engine gets to normal operating temperature runs smooth and no misfire only does it when cold after warm up goes away. Go to the web site, go to town hall, Infiniti G35 owners, problems & solutions, citations 967, 334, and 751. 2004 Honda Civic EX 1.7 MTX 4 dr 170k miles. CEL came on about 2 months ago solid. I reset the codes, changed the plugs. The codes were p0300 p0301 p0302 p0303 p0304. The old plugs looked pretty clean no oil whatsoever, but gaps looked a bit big, so I got the expensive plugs. A few weeks ago the cel came on again, this time it blinked. I changed sparkpug and wires car ran ok for a few weeks but now po 300 comes up. On my 2004 yukon. 13 people found this helpful. Had random misfire code p300 on my 2007 Yukon Denali, ended up being no ground on passenger side and needed new throttle body.gmc said I just needed new engine (8100.00). 93 Posts. Discussion Starter 1 Feb 16, 2008 (Edited) Codes p0300 p0301 p0302 p0304 p0420 p0701. I was on my way to work this morning after my car was warmed up and i made it about 15 minutes when it started cutting out every 10 seconds or so and then the check engine light started flashing and the car dropped to around 700rpm and started. I am getting the check engine light with code B14A1 when I drive hard with the AC on. Anybody getting this The check engine light goes away but comes back if I drive it hard with the AC on. Just started getting this in the last month. I have a ECUTEK tune by Dynotronics. Car drives fine. The misfire detection (P0300) is more then likely unrelated to the EVAP trouble codes. You should conduct a complete tune-up (replace plugs, check coil packs and coil pack circuits), and check to see if the Check Engine light turns on again for the same P0300 trouble code. The remainder of the codes might be related. 0L equipped Ford is a misfire condition causing one or more of the following misfire codes P0300, P0301, P0302, P0303, P0304, P0305, andor P0306. 4L hesitation comes and goes decided to changed spark plugs with motorcraft and.