Hi,
-Pull your COP’s, shine a light down and look for moisture, this is very common...Resistance testing across the COP’s as follows.On our COPs the two terminals where the harness connects to each are the Primary windings. They should read between 0.3 to 0.8 Ohms. Between the coil output (Secondary) and either of the primary pins you should get 4k to 10k Ohms. If one’s zero, it’s open and needs replacing.
-Look at all your COP Connectors, if the retaining clip is gone, they can back off the pins. Tie wrap around it to hold the connector on tight, for now- replace faulty connector(s).
- The same goes for Fuel Injectors, verify the connections are good and held on tightly.
- Pull your Plugs and verify the electrodes are light Tan to Black in Color. If worn, replace. Otherwise, clean- Regap- Never seize on Threads- Reinstall.
-Pull your Cool Air or Stock intake apart and clean the MAF, Throttle Butterflies, IAT and Intake internally, with CRC MAF Sensor cleaner.
- Check all your
- Check around and verify there’s no Vacuum ines that are poorly connected, or dryrotted. Replace as necessary.
- Have you Had any CEL’s show up? If you have a Scantool- great! If not, Borrow, or Advanced Auto will have one to look at real-time Data & that does a drive cycle Datalog. Seek out PENDING Codes. View Data in the recorded Drive when stumble occurs in the Cycle, look for a Sensor, I.e. 02 Sensors, etc.. pegging in one direction, not correcting back & forth as designed. Watch at Idle as well, live.