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Old 12-17-2008, 05:43 PM   #8
MT-2500
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Re: 99 4.3 Rough Idle, Low Temp, Bad Gas Mileage

Make sure engine is getting up to 195 running tempt.
Check for vacuum leaks and egr and pcv valve sticking.
Check fuel presure for up to par.
And go over all computer readings for up to par.
Double check plug and wire and cap and rotor on no 4 cly.
Run a compression test.
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