This car has like a million miles on it but still a great little get around town car for the kid. Just started getting a P0300 code (Mult. misfire). Did a diagnostic long term fuel trim is -12 but when going down the freeway and take my foot off the gas it goes to like -27. The short term fuel trim is fine running from -3 to +3 on both banks. I don't think it is a fuel problem going to put a gauge on it later and check pressure at fuel rail. Question should my Long Term Fuel Trim adjust that quickly? Also going to start checking plugs and coil packs. Did a vac check (break cleaner) and didn't notice any change anywhere and cant hear a hiss anywhere. Just wondering if I'm on the right track. I know I should check compression but don't have a gauge for that yet. Here I come Harbor Freight. Thanks for any thoughts.
