1989 2.9l trying to get it to pass CA smog but hydrocarbons are high...idle is around 1000rpm (i have re timed it a bunch to 10btc) very rough but no hesitation while going up through the band and smoothes out about 1500. thought maybe missfire or a clogged injector but replaced fuel injectors, spark pugs, wires, cap rotors, EGR valve, MAP sensor. ran seafoam through it too and nothing. tired of throwing parts at it so any help would be awesome. oh and compression test passed and i do not think it could be o2 sensor because just hydrocarbons are high.