Ive been getting inconsistent fuel mileage in the saturn and exhaust pop at idle fairly often was tuned up 2000 miles ago. Wires tested good, coils are good, no cel. Intake gasket and vac lines are good. O2 sensor seems to be switching pretty good. I cleaned the throttle body no change. Spark plugs looks good to. Egr is clean to. I drive the same route everyday and last time I got 36mpg this time 31..... same station and pump to. What else toncheck
Last edited: