2.8 V6 when car idles it shakes/vibrates Check engine light

[futbol90x]

2007 saab 9-3 aero 147k


Hello my car feels like it struggles like its going to stall (automatic) when in idle or in reverse unless I'm moving . i took it to the mechanic and he cleaned the fuel injectors/ re=gaped spark plugs and performed fuel injector cleaning and did fuel reset trim. He said everything looked fine and the problem went away for a few days There was no check engine light when i took it in . I drove the car for a few days before symptoms came back but this time check engine light came on. I spoke to previous owner he said he replaced all ignition pack and spark plugs last year. These are the codes I'm getting


any help?

p0300 random/multiple cylinder misfire detected
p0305 cylinder no. 5 misfire detected
p0306 cylinder no. 6 misfire detected
p0300 random/multiple cylinder misfire detected
p0305 cylinder no. 5 misfire detected
p0306 cylinder no. 6 misfire detected
p0303 cylinder no. 3 misfire detected
p0304 cylinder no. 4 misfire detected
p0741 torque converter clutch solenoid circuit performance or stuck off

[nordwulf]

Do you know if they used the correct spark plugs and Saab OEM / Bosch ignition coils? If they installed the wrong spark plugs and used Chinese aftermarket ignition coils, that's where I would start and replace with the right parts.

https://www.eeuroparts.com/Cars/SAAB...gine-Ignition/

How old is the battery? Saabs seem to go through batteries pretty quickly and all kinds of weird electrical stuff starts to happen when the battery is on its way out.

[futbol90x]

coils are ac Delco and the plugs ngk lfr7aix

[nordwulf]

A quick search shows those are spark plugs are for a Mercedes-Benz V8 engine. So start with installing the correct plugs for your engine and see if the problems go away.

[Saabian]

https://www.ngk.com/product.aspx?zpid=9871
Use these spark plugs. And gap them to 0.8 not 1.1 as NGK suggested.


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