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i think thats the next step cause no check engine what kind of places do a good dio on vehicles?

oh yeah i also unhooked the exhaust before the cat and still nothing

yes the plugs are in the right fireing order and i just replaced the o2 sensor still nothing i am totally confused with this. I am out of things i can think of so any help would be nice

hello i have a 93 sahara yj. the engine was just rebuilt and heres the problems. First it has problems starting up not everytime but most of the time. it won't rev past 4000 rpm and it has no power and bad gas millage. i have replaced the spark plugs, the wires, the TPS, the fuel filter, i...