drive to park and almost stall.

[TimMahaney]

Hi my 2001 saab 9-5 2.3t wouldn't start after shop had replaced my headgasket on a new used engine for me. car wouldn't start for me but for some reason would work fine for shop then I took it home again running, next day I go out and car wont start so I pulled codes one was for crank position sensor. changed That and now it starts first try every day so far. The rpms are at like 800-900 idle and is pretty rough for idle. one of the other codes was for a misfire in cylinder 3 and the last one idk what it was but ill post codes for all of them when I find them. But to the real problem on hand is when I stop and put my car into park the rpms go way up then drop really low and my car acts like its going to stall and I think the oil light comes on sometimes. I checked oil its fine. For those codes they are p0337,p1312,p1334. There is also what seems like a thumping sound that I don't really know how to explain coming from motor. Any and all help will be much appreciated.

[CaptainMediocre]

In my experience the codes for misfires were corrected by a new direct ignition cassette and new oem spark plugs. Only use the OEM NGK plugs, don't even think about using anything else.

55559955 Genuine SAAB - Direct Ignition Cassette (Black) - Free Shipping
30520467 Aftermarket - Spark Plug (OEM) - NGK BCPR6es11 - Free Shipping

[TimMahaney]

okay so my cars rpms drop from around 800 to 337 from what my scan tool tells me and this only happens when I put my car into park im not sure if it is because of a vacuum leak or what. would a vacuum leak cause this to happen? please help I did order some vacuum line to replace the old stuff something like 10 ft is all the vacuum line system the same size line?

[TimMahaney]

Okay so I have been trying to put it off but its now starting to get on my nerves. Oil consumption is pretty high I don't see any leaks on my driveway so I assume its just burning up. The other day when I came to a stop sign my car put out a big cloud of smoke and smells like burning oil. I still get the p1334 code (Combustion Detection Cyl. 3+4. Open Circuit / Short to B+.), and p1312 (o2s switch point rich senson 1). I know those two lead to DIC but I also have a knock on acceleration and wanted to know if those misfires or whatever in cylinder 3+4 would cause a knock on acceleration... The knock cant be heard in idle or it is just so silent I cant hear it or when coasting. Only time it happens is on Acceleration that I can hear.