Hey All of a sudden I’m having a problem. I have a 2000 bmw 540i and when I start the car it idles rough and stalls out. Before I changed the cam shaft position sensors and I’m sure it’s not that. I’m thinking maybe fuel filter, injectors or something with the intake. Any thoughts?
Smoke test for vacuum leaks. Check Throttle Body gasket-- is it one of the "thicker" ones that tends to shrink as it ages? If so, replace it. Check intake pipe between MAF & your engine-- has it loosened w/ age? Might need snugged down. While you're in there wouldn't hurt to clean your MAF & Throttle Body. Ensure your MAF is snugged down too. Evaluate MAF -- it might be going bad. Search for DIY on all these at Scotty Kilmer YouTUBE.