Did the problem start right after the install of the headers. Just for the hell of it, unplug the o2 sensors and see how it runs with them disconnected. Like I said, mine have been disconnected for 2 years and Ive had no problems and get 25 mpg. Try it and see what happens, if you get some increased gas mileage, then there is a prob with the o2's.
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89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.
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