[Rodney Nelson]

Originally Posted by PeteKz

The CIS does not depend on electrical parts to operate when fully warm. They are there to help the engine start and run when it is cold. The parts that have electrical power (WUR, TTS, idle valve, etc.) use electricity to run internal heating elements to warm them up before the heat from the engine fully warms them up. Once the engine is fully warm, they don't do anything further. Thus, if the engine still runs badly after it has been running for say, a half hour, then you are looking at the ignition for electrical issues.

Ignition: check that you are getting a spark at each plug. Disconnect the plug to the CDI box and spray it out, if you haven't already. Likewise for the plug to the distributor. Pull out the plugs and inspect them.

Don't yet rule out the hypothesis that your CIS is not calibrated or functioning correctly. While simultaneous failures are rare, they do happen, and something else in your CIS could be causing a problem. Pull out your injectors and see if they are spraying correctly. Yeah, that's a PITA with the steel lines, but at some point, you have to check them. Better yet, pull all six out, and put them into test tubes (or something similar), and check that they all delver the same amount of fuel.

Just found out that #5 is not firing. I pulled out each spark plug connector and there was a change, not for #5. I inspected the plug, it did not look bad. I cleaned it up anyway, some 2000 grit sandpaper and a wipe down. Back in still no spark. inspected the cap again, still looks good. I tried to see if the boot would spark disconnected but I could not see anything and I could not see anything with #6 which seems to be working fine. I think it is not getting a spark to the plug. So are we not looking at a boot or wire issue?