OK, fail the emission. CO is about 4.5 above limits at idle. I need help before spending $$ with a mechanic. Here's what I've done so far: 1. changed plugs 2. changed wires to 8mm 3. spray clean the carb 4. changed oil to do list: 1. caps and rotor on order 2. replace air filter What else do I need to do? The previous owner had the idle too high so I adjusted down. The computer reads about 610 - 630 rpm during the test. Will adjusting the idle up to like 800 rpm and changing the air filter will bring down the CO? Thanks for any tip(s). Sorry, it's a '78 with the F engine.