Re: Engine stalls at highway speed - Saab 9-5 Bulletin Board - Saabnet.com
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I found these comments on another site for that code combo - it can be mysterious:
The vacuum line on the back of the throttle body going to the evap system was nearly completely broken off. Of course it's one of those "two sized" vacuum lines and I can't find it on eeuroparts and the dealer will probably want an arm and a leg for it.
I was running a set of PFR6H-10 plugs, but after noticing the misfire I switched them out for a fresh set of BCPR7ES. I run them in all of my other 9-5 Aeros (I currently have 3) without issue.
Random misfire is caused on the boost side, Bad DIC or fueling.
You have messed with everything except the pressure side it seems. Small leak in piping, IC, throttle body can cause 1300.
Check the o-ring around the top of the throttle body, the old rubber ones turn to cardboard and flatten and the hard plastic of the pipe will not seal. That is the first place to check. The seal should be round o-ring shape not flat. New ones are silicone
Under the TB o-ring will also flatten and dry our too, you can check that as well
After that look at your IC hoses, inspect for leaks that will appear under pressure ( like a split you can only see when bending the hoses.
Then then test IC, a tiny hole or leak in a seam will cause this as well
Check fuel pressure when under load.
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