Its been going on for a few months at idle i have a flashing check engine light on 2003 Mazda B3000

I took my truck to autozone and had the codes read. it came up with a misc misfire and misfire on cyl number 6. the check engine light only flashes when i sit at idle. i replaced spark plugs and wires. replaced the coil pack and i still have the rough idle and flashing check engine light. this only happens at idle. i lift the rpm to 1000 or higher and it goes away. any insight or help will be very helpful

by in Denison, TX on June 09, 2013
2 answers 2 comments
ANSWER by on June 09, 2013
Vacuum leak, low compression or faulty fuel injector. #6
ANSWER by on June 09, 2013
Agree with pushrod, you can use a carb. cleaner to check for vacuum leak. While running, spray on vacuum hoses. If the engine surges when you do this, you have found the leaky hose.
COMMENT by on June 10, 2013
i tried what you said and nothing happened in terms of a vacuum leak. ive ran at least 3 tanks of higher Octane gas through the truck with the fuel system treatment or fuel injector cleaner. and it was no help. im think i am going to take it to a local shop to have them do a compression test next. if nothin abnormal comes up i guess i need to remove the intake plenums to get to that injector and inspect/replace it
COMMENT by on June 10, 2013
If compression is ok and no vacuum leaks, may just fix this problem by having injectors professionaly cleaned. Had a 2004 Excursion #5 misfire, pressure cleaned injectors and fixed it!! Listen to #6 injector with a long screwdriver to ear and touching the injector, if clicking cleaning is the best thing to do first! IF no clicking can be heard, possible bad injector or pulse circuit.