Multiple misfires are very hard to diagnose, have a pro scan it and freeze frame it to seeif anything is out of whack electrically. A lot of times sensors won't set a code but will read wrong voltage wise so they can try changing that part. One other thing if this has s K&N type filter on it clean it out but don't oil it, clean the maf and see if that helps. It's only with those type of filters not factory ones. You could check for a vacuum leak with choke cleaner as that can cause it as well then or if you have done this tuff do a compression checkon all cylinders. If there is a 20% variance on any of them then check to see why on the offending cylinder/cylindrs. Of cours it cold be ahead/intake gasket leak as well if you are losing coolant.
Friday, July 19th, 2013 AT 4:35 PM