The KA24DE in my 620 was bogging and sputtering over 4k RPM's, so I ordered a new MAF from RockAuto and it fixed that problem...but it caused another couple of issues. Now when its cold it idles kinda rough until warm, frequently dies when warm at idle, and after running for about 10 mins, it totally bogs and hesitates until I shut it off and restart it.
I suppose I could replace the TPS and IACV, but I did not have these problems before replacing the MAF, so im not sure that will fix anything. The PO's electromotive fuel pump was stating to make so much noise I could really hear it in the truck so I replaced it last weekend with a GSL 293 and Wix. That did not fix anything (but it's nice and quiet now).
The other thing I dont understand is how do I pull the CEL codes off the ECU if I dont have a Check Engine light? I'd love to know what the codes are but dont know how.
Any help is appreciated.