2000 300m stalling upon slowing down...

Has the throttle body been cleaned?

bogging it just cuts off. Scenero- Crusing on highway @ 75mph, approaching exit, applying breaks, the tach will slowly fall from 750 rpm's to about 500 rpm's and then just drop to 0 and stall. Then I drop into neutral and start it up and go......Could it be the MAP or EGR ????????????

Clean the throttle body and AIS thoroughly. Carb cleaner on a rag works for the throttle body, short blasts of carb cleaner into the AIS intake with the engine running cleans it well.

Be sure that the labeling on the can says that it is safe for fuel injected vehicles. There are claims that certain solvents commonly used in *carburetor* cleaners will destroy o-rings commonly used to seal fuel injectors to the head and/or intake, and that a cleaner specifically labeled as "injector cleaner" or "safe for fuel injected engines" is by definition certified by the manufacturer not to contain the damaging chemicals. Some here will argue with this supposed risk, but without proof either way, are you willing to take the risk?

Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x')

Good CYA advice... HOWEVER:

1) I've found that "injector cleaner" just flat doesn't clean as well as good old noxious carb cleaner

2) What we're talking about here is sending the cleaner through the AIR pathway in the intake system (and for the most part just spraying it on a rag and wiping out the throttle bodies at that), so the exposure to the injector O-ring seals is very minimal to nonexistent. If we were talking about putting carb cleaner into the fuel rails so that it actually passed through the injectors, that would be a different story.

Whose 'A' am I 'C'ing?

I've been thru that discussion with maxpower. The injector o-rings are the sealing gaskets, and as such there is some surface, admittedly small, that is exposed to whatever flows thru the air pathway. The o-rings will be exposed to the cleaner either in liquid form or fumes. Cracks in o-rings to not confine themselves to the initially exposed area - they grow. We can disagree on this - you use the carb cleaner, I'll use the injector cleaner - we'll probably both be fine.

When I sprayed injector cleaner into my throttle body per the instructions, the black gunk instantaneously melted away like butter and I was left with nothing but shiny metal showing.

Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x')