alrit so i have an issue wit my 99 2.8. After ive been driving on the highway for awhile and prepare to slow down to get off my exit for where ever im going i neutral it and it idles around 500rpms and then like dies as if my car has stalled even though its in neutral can anyone tell me what might be wrong?

 

your TB needs alignment,

 

stupid question but tb= timing belt and how much would that cost to have done cause dont wanna spend to much money on anything at all right now

 

i think he might mean Throttle body

 

either throttle body or it's your idle control valve, mine will periodically stall if i'm in neutral just sittin in a parking lot for like 10 minutes.

 

I had the same problem with 96 A4 2.8, "Drive on highway finethen , stalls on exit ramps". I had a buddy scan engine code and was P1504 "Manf. cntrl veh. spd Idle speed control Auxillary inputs". This gave me a place to start. I removed the intake manifold, striped it all apart and did a good cleaning, it was dirtier than I expected. Dirtlooks like black carbon and also notice white substance coming from the PCV hose. I went futher and open valve cover. It was messy "white creamy substance" which means I need to replace the cylinder head gasket. Coolant is mixing with engine oil. I didn't have the timeto replacehead gasket but, willdo in a month. ***Cleaning the intake manifold, throttle body, idle speed control and PCV hose made the car run smooth without stalls. I still have to address coolant leak which also cause the white substance to end up in the throttle body. I did all these within 3 hrs.Cleaning took the longest. Having air tools helped allot with the speed.