Right.... Yes it only opens a crack at idle. When I give it throttle it opens further. If I really rev it up the plate drops down about another 3 inches. However during the transition from cold to warm there is a point when it is almost to full operating temp. that plate will only open about an inch or two even when I rev the engine. And when I do its almost like its choking for air. if I push the plate down by hand as I give it gas it seems to run ok. I have never had this happen twice while driving. It happens once just as the engine warms up to operating temp. I have a multimeter without a duty control (below) and I hooked it up and set it on 20 DC as shown. I put in in #3 and grounded it with just key on. Got 6.6 reading. I started it and as engine warmed up it dropped. When fully warm it stayed steady at 1.07. Does this help or do I need one with duty cycle.
Any help to you guys. I also tested the engine temp sensor when fully warm and it reads .52 ohm 's.
Thanks Again for trying to help a benz newbie out
Vinnie

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Vin