Hey all, I converted my car back to the stock ecu (using the aristo ecu) as the buyer of my car wants it on the stock ecu. Does the aristo ecu suffer that same lean spot of obd1 mkiv ecus? Cause my car goes lean up to like 4k (14.5 a/f @ 18 psi isn't good, haha) then drops to 10.8 a/f.. It runs good besides that no codes or anything, and pulls hard.. i think harded them my ghetto aem tune.. (i am noob tuner lolol)