Is there any A/F meters that I can use with the stock sensors that display a A/F ratio graph similar to those used with dynos?

 

no, you need wideband for that
check out plx m-250,300 and innovative
(but theyre not going to be graphs)

 

Yeah, the stock O2 sensor won't give you anything even close to accurate.

 

I'd like to invent some Wideband O2 sensors that replace stock o2 sensors on an obd2 car that enhances the ECU's ability to map fuel. let's make something! lol.. I just want something to chart out my A/F ratio, so I can tune my VAFC2 without having to go to the dyno. I have a big feeling my A/F is irratic robbing my power around the 4000-5000RPMs and some low end.

I think I'll find myself at the dyno shop later this week, I hope an hour is enough time to play with the VAFC2, Ignition timing, Cam timing, and FPR.

 

Would a bad cat check engine light cause my engine to run a rich a/f ?