Popping in the exhaust system, the leak possibly, and as far as the bad mileage my thought is getting the air/fuel ratio checked along with the timing. The next thing is to do a compression check and leakdown test on the motor to see if something is amiss. Also, what condition are the injectors in? Have you done the cap and rotor? Valve adjustment?
How many miles do you have on that thing?
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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