I had been using the stock ecm modded for 72# injs with a screenless MAF for quite awhile. I always had a horrible tip-in problem. If sitting at a stop sign and you tried to go to 1/4 throttle, the car would die. I had to EASE into the throttle to get the car to move without killing it. This was even more fun at the track when doing a burnout or staging. Another prob was if you were cruising down the road at say 40 mph and let off the throttle, you could watch the rpms drop to 300.The faster I would go, the worst it got. It was real treat when approaching a stoplight. Even more fun when going thru the traps. Half the time the car would die and it was a mfr to try and get it started again. Starting was an entirely different monster all together. I would have to crank the car sometimes 30 seconds to get it to fire. If the car was warm and you wanted to start it back, you could just forget that. It was if the car was flooded. I had to wait until the car cooled off before starting again. Then once started, the rpms would be all over the place, oscillating between 700 to 1800 rpms. We tried everything, at least a dozen different MAFs, coilpacks, IACs, plugwires, chips, ecms, and just about every sensor on the car. Nothing made a difference, and I actually ran a 10.68 @ 128 with this turd Then I hooked up with Steve Y. I bought and installed the ME-R. This is the mafless version. It's like having a brand new GM car. The throttle response is unbelievable. Acouple of days ago I was sitting at a stoplight and I decided to hit it pretty hard........WOW.......The car shot up to 22lbs and when it hit second gear the rear tires went up in smoke. The car now sits at 900 rpms and doesn't go up and down. When I let off the throttle, no matter the speed or how hard I'd been in the throttle, the rpms would drop to 900 and stay there. Now when I go to start the car all I have to do is hit the key once and it fires, almost instantly. I could be driving the car all day, shut it off and it will still fire right back up. I also have to say that the support for this product is great. It's not like some vendors whereas once they get your money, they are done with you.....This is the best product I have ever encountered. I would reccomend this to anyone. I might stack all my MAFs in a pile and start a bigass fire and roast some weenies.........