87 Astro runs lean
June 25th, 2012, 8:41 PM
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87 Astro runs lean
My 87 Astro runs lean in closed loop mode...often backfiring. It runs ok in open loop (cold engine). I have replaced oxygen and coolant temp. sensors, checked timing. The fuel pump is fairly new and the fuel filter is brand new. No codes are set. What now? Thanks.
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