cold air intake

I have an Airaid cold air intake and an airaid throttle body spacer on my 97 Tahoe. I keep on getting misfires driving on the interstate. I took it to the dealership and there were no codes in the computer excpept it said the timing was off and the air/fuel ratio was off. They fixed the timing but could not fix the air/fuel ratio because they said they couldn't do it since I had the intake and tbs on. Does anybody have any suggestions on what I could do or what could be my problem? I have replaced all plugs, wires, rotor and dist. cap with ac delco parts and that still hasn't solved the misfire.

O2 sensors may be faulty which would collect a bad reading for the computer.

Sounds like bullshit. Your problem lies either in the ignition module?pick up coil or in the fuel pressure (bad pump, presure regulator, bad injector, and such. Or in the map or TPS sensor (O2 possible as well),
1 ignition module
2 pick up coil
3 dad fuel pump
4 bad pressure regulator
5 bad injector
6 bad MAP sensor
7 TPS sensor
8 vacuum leak
9 Plugged up cat or muffler.
10 ?????

Check all these