Question about 1992 Ford Bronco

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Ongoing problem. On the 92 bronco with the 351w, replaced o2 sensor, idle air bypass, which was sticking, put in a msd coil, cap,wires. cleaned all the plugs again, and let the cylynders air out. replaced 2 coolant sensors. now it has a miss @ idle and my timing light is doing wacky things. timing is right on @ 10 btc. can't figure out the miss or reason for the rich condition. will take any more suggestions

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Ignition module in the distributor may be breaking down!
its a common fault as they dont like getting hot!
spark plug gap is critical with these types of sytems
test each plug as you may have fractured one when fitting it

Posted on Jul 19, 2009

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Turned out to be an O2 sensor. You can sometimes clean them with gasoline or acetone. That may be worth a try depending on the price. If any check engine lights are on go to an auto parts store and have them test it on their diagnosis machine. it's free and would identify the O2 sensor giving you the problems.

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