Do you have an alternator on the car and what voltage are you seeing it charge the battery at? Contrary to popular belief you can tune an engine without O2's
I have the factory gauge in the car. Haven't put a volt meter on it to know.
Yes i realize that and have done a lot of tuning with a timing light, 60 foot and mile per hour.
However, you can't watch it go lean or rich as it pull thru the rpm range with just plug readings.
Playing with air bleed is were an o2 can shine.........If it works.......
