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99 forester stalls intermittently at stop; then lurches forward when I press the gas. Mechanic stymied. Need advice.


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No IACV hose on the 99.

 

The Idle Air control valve is bolted direct to the side of the throttle body and that style valve is known to gum up and stick.

Remove the valve and clean it, as well as the bore inside the throttle body where the valve cone sits. This may remedy the problem temporarily. Usually this style of valve just needs to be replaced, but it only takes a few minutes to clean it and see if that makes a difference.

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Whether it is or isnt, it is not an optional thing to do, it must be done, along with thw water pump, seals, and Tensioners. It is possible, and if it is that worn STOP DRIVING IT NOW. Continuing to use it is the differnce between a 750-900 dollar repair and a 2000.00 repair.

 

 

It can also be spark plugs, filters, wires, which also need to be replaced regularly.

 

I am also afraid to ask, but are you the original owner? how oftne is the oil changed? DO you check the oil level?

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Ok a few things.

 

Oil change interval is 7500 miles, I tend to do it every 5000 miles, if your ok with 3000 miles so be it

 

You are seriously overdue for a timing belt job, including water pump, oil seals and idler and tensioner. This is a very very expensive repair if not addressed like yesterday.

 

Also you are way more over due for tuneup, plugs, wires, and PCV valve. Air filter too.

 

Any and all can cause what you are seeing.

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