got a 2007 ford f150 4.2 v6 2x4 . its throwing a code p353 which is primary secondary circut malfuncion.ive replaced all the plugs and plug wires. i had washed the engine prior to this issue starting. it acted like this at first. then got better. now misfiring at idle. once rpms incresed smooths out. but lack of power on accerleration. was told by mechanic that the pcm was possibly bad.an other items to elimante before i spend $$$ on a new pcm