Please help CLK problems
 

to make a long story as short as possible I picked up a 1999 CLK430 and had the MB dealer do the inspection everything came back fine. The car had the mass air sensor replaced about 4 months ago by the same dealer for the previous owner. About a week or two after I purchased it I noticed that when I punch the gas real hard the car was basically falling on its face and accelerating real slow with the RPM's at about 3500 rising very slowly. I took it to the a different MB dealer (where I live) and I had them service the tranny to be safe. It still ran bad when hitting the gas hard so I took it back again to the same dealer they ran some more test rest the adoptions and said the only thing that came back with any problems was the crankshaft positions sensor instead of paying another $300 to have them do it, I ordered it and replaced it myself a couple weeks later but since they had re-set everything it ran great for a week in between. Before I replaced the CPS I did a battery reset at my house instead of going back to the dealer and that fixed it for another week or so. Right before I actually did replace the CPS it started doing the same thing again. This time I took the car to a very well know independent MB mechanic called MBI here in Portland OR. They did all the test they could said all the adaptions where almost perfect but did say that the CPS had not been reset since I did it myself. They cleared the ME (Engine Electronic Control Module) to the initial factory settings. And of course the car runs perfect again. They said that if the problem comes back then they are pointing to-wards a new computer. They said I could get a used one and send it to Beckman Technologies in N. Carolina and they could unlock it for me. I called them and spoke to a gentlemen and he really doesn't think I have a bad computer he said these computers are always mis-diagnosed and they are a very reliable computer. So right now I'm stuck and really hoping the problem doesn't come back and something MBI did get fixed but if someone has any ideas as to what the problem could be please please help me out here. Oh yeah car runs perfect all the time if you don't punch the gas, I only know there is a problem when I step on it.
Thanks so much

No offense, but it seems like you are taking it to one too many mechanics. Find one you trust and stick through their diagnosis and repair. If their diagnosis is wrong and their repair doesn't last, they are responsible for revising their position and doing what it takes to fix the problem. What's happening now is you are bouncing the problem from one tech to another without giving them a fair chance to see the issue to resolution. You are also installing parts yourself which, of course, comes with no warranty. If a competent, fair mechanic replaces the wrong part he can at least take it back and not charge you for it (unlike in your case where electronic parts are not returnable once installed).

Also, from my experience with hot film type AMMs (most likely what you have), they do fail quite regularly. I am on my third one in 12 months. Of course the source of the first two was suspect (eBay vendor) and they failed within days of installation; the one I ordered from Fastlane (this site) has been perfect so far.

If my gut instinct is correct, I wouldn't rule out your AMM being bad, even if it is new-ish.

I'll second the concept of a AMM, but a real tech with suitable tooling will be able to evaluate it very simply which I imagine the indy did. I also agree with Beckman it is almost never the controller. You are more likely to have 5 bad AMMs in a row than one bad ME controller in the cars lifetime.