Thank you, I installed a 95 harness with the modern PTU connections (no sub-h). Have swapped to another PTU = same result. I have good spark on both. Vague smell of gas on plug when pulled after running. Code 13 & 34 continue. Showing bad O2 on left (bad cyldrs side). Ash did my chip a few years back. Can the ECU get confused/shorted?