Misfiring and won’t rev past 3000 rpms.

Question

Have codes for random misfire, secondary circuit coil #1 ionization failure, and intake air temp circuit high. Missing every revolution on 1 and 4. Rough idle, won’t rev past 3k, hardly shifts.
I have .45 volts on what appears to be the common ground shared between all the injectors. Anyone have a pin diagram of the connector under the intake tube?

Answer 1

Here is the wiring diagram from the factory service manual. Have you checked or replaced the spark plugs?