my yukon just started running weird, like a random sporadic miss and came up with the bank 1 and 2 rich codes. i havent checked the fuel pressure yet all i had a chance to do is plug in the torque app. my ft'* are like -30 and most everything else is normal i think. i got a couple things to check from searching like the fpr is in the intake and can leak or the injectors same deal.

also whats the maf at idle supposed to be mine was 0 then went up some when you revved it up?

thanks for any info
justin

fuel pressure is normal, cleaned the maf and its reading normal now but my ft'* are still -28 to -30. took apart the intake manifold there are no fuel leaks.

"intake apart and no fuel leaks"

Looking for a leaking injector(*)? Might not be a bad idea to update the injectors (SCPI to MFI).

thanks, i think it only can be that or the fpr. i dont really want to spend the money on that, and i would think i would get a misfire code to go with it if it was the spider. so im going to get a intake man gasket set and the fpr and put it back together see if that fixes it. if not im only out time. what a ridiculous design this thing is. took me like three strait hours of hanging over the engine on a stool just to get the upper man off.

Amazon'* price is pretty good for the update. Your Yukon is 13 model years old. With the update comes a new FPR. Seems with a new upper and lower intake manifold gasket, with the MFI injectors, you might not have to touch much of anything except plugs/wires and distro cap/ rotor for a long time IRT fuel/ igntion.

Good luck with the diag/ troubleshooting.