ML320 Petrol Automatic - I have been experiencing problems with acceleration. When I set off on cold mornings I have to stop several times and switch off the engine. If I don't, the car will not reach more than 30 mph and sometimes even slows down. If I switch off and count to 10 it will sometimes then start and accelerate OK. I sometimes hear a sound like air in a central heating system when I turn the engine off.
Also it sometimes starts to slow down when i step on the gas too quickly. When overtaking it dangerously accelerates to begin with then slows right down in front of the vehicle I'm over taking which not only makes then really cross but is dangerous!
If I switch on the engine to warm up and the engine sound drops down before I start off it is sometimes better.
My local garage isn't very good at diagnostics so please help!!!
Also it sometimes starts to slow down when i step on the gas too quickly. When overtaking it dangerously accelerates to begin with then slows right down in front of the vehicle I'm over taking which not only makes then really cross but is dangerous!
If I switch on the engine to warm up and the engine sound drops down before I start off it is sometimes better.
My local garage isn't very good at diagnostics so please help!!!