Ive had the following items changed spark plugs, fuel injector, and 2 coils. Took it to firestone today for computer dialysis. these are the codes po307, po308, and po358. Car is still missing and they didnt have a clue, and wanted to charge me 85 dollars and hour to go deeper.

Any thoughts?

 

Remove coils from clinder 7 and 8 and measure the resistance between the terminals(use a voltmeter, you can borrow this at some mechanic shops), it shd show a resistance between 0.5 and 1 ohm (put the red cable of the left terminal and the black on the right terminal). If the resistance wavers with different values you know the coil is bad and replace that coil only. I see that you have replaced 2 coils hopefully you did coil 7 and 8. If this is case, when coils are replaced code p0358 will disappear. Also i'm not sure how many spark plugs u have replaced? Check spark plugs on cyl 7 and 8.