Reply to thread

Message: <blockquote data-quote="MustangChris" data-source="post: 703794" data-attributes="member: 10830">well,crawl under it and look and inspect the cats. that could explain the CEL and you could kill all three birds with one stone.Bad cats = bad o2s.bad o2s = bad input for computer.bad input = bad performance and CEL.2 new cats = fix everything.BUTive never once heard of bad cats causeing bad enough issues to make a car "perform" noticably different. just MPG and CEL.id do the basic checks, starting with the cats, the o2s, and getting the CEL read.then move onto the air filter/PCV (simply because its the easiest) replace the PCV valve if its bad, and the air filter if its dirty.then ignition. are the coils cracked? wires cracked or torn? spark plugs in good condition?then fuel system. change the fuel filter. check the pressure at the rail.also, check the vacuum lines. they are getting old and brittle and crack easily (you probably know, you've got them on your 5.0 lol.)are their any other "symptoms" other than "poor throttle response" and the CEL? bucking? back firing? noises?</blockquote>