02 4runner sr5 sport with 210,000+ miles (stock). Lumps at idol at random mostly after it was ran for a few min and restarted. Replaced all coil pack, spark plugs, fuel filter and the o2 sensor. Sprays carb cleaner all over trying to find a vac leak to no avail. Cleaned the maf sensor but still no better. Every time I clear the code by removing the negative battery lead (P0300) it runs like new for about 2 or 3 days then the dash lights up once again and the lump returns. Tired of throwing money at it please help
Why does the misfire go away when i clear it? Is my ECU fried?
lean air/fuel ratio-fuel pump
faulty maf/vaf sensor
large vacuum leak
Ignition system fault