You said you car drives fine now. you mean with SPARK & FUEL it drives fine with no buck?

OK.. so now your setup is the same as mine... you used shield cable all the way to the CPS and tapped into there. then you CUT the ground wire of the CPS, and connect the GROUND wire to the Megasquirt Ground. and you leave the 9V powered by the STOCK ECU. is that what you have setup right now??
-STOCK ECU only connected 9V and signal to CPS
-MEGASQUIRT only connected signal and ground to CPS (am I correct on your current setup?)

So if it is, I guess the only difference now from mine to yours is the ground wire. I will try that this week!
coz even mine without REV LIMIT, I still cannot drive my car with SPARK coz it bucks! But I will try it out again tonite. coz last time I had my REV LIMIT set to 17000 only when I try my SPARK. maybe I should change SPARK again since now I set the REV LIMIT to 25500.

Thanks Wicked.