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Hi I have a ALH beetle 98 TDI, I just brought the car for cheap it has a problem though it's stalling and shutting off at idle. It has about 145k miles.
I don't know what the problem is, I've replaced the MAF since it was bad, What else could be the problem,
The previous owner bought it to fix up but gave up as well.
Could it be a timing problem, I figure the belt should have been changed and some screwed up the DP timing how do I confirm this, Any other thought on possible problems
 

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Clogged fuel filter, clogged fuel lines at fuel pump, bad injection pump.

To check the timing belt position you must set the engine to TDC and inspect the index marks. See this article for details:http://www.myturbodiesel.com/1000q/a4/ALH-engine-timing-belt-change-VW-Jetta-TDI-1.htm

It could also be a clogged intake or intake valve (anti shudder valve) closing. see this article: http://www.myturbodiesel.com/1000q/a4/clean-intake-manifold-VW-TDI-carbon.htm

Lastly, check for all codes and for broken vacuum lines. The EGR, turbo, and intake valve are all vacuum controlled.
 
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