I know this is a car, but CC said it would be cool to post up a thread. I hope everyone else doesn't mind. I am working on an L98 TPI from an '89 Trans Am. I Ran a compression test on all 8 cylinders and found 120#s across the board with very small deviations on two cylinders of only about 2-3 pounds. I set the base timing by disconnecting EST connector to 6BTDC with car in drive. I then set base idle and finally TPS to .54 volts. When I was setting the timing I noticed that the bulb did not flash on the timing light every single time, but it is one of those cheap timing lights. I am beginning to wonder if something is going on inside the distributor. One thing to note is that when I had the distributor out and would hold it sideways and spin the gear with my hand it appeared that the pickup coil was touching/hitting slightly, but when I would hold it vertical as if it was in the car it would spin smoothly. Injectors were all ohm checked and are remanufactured with virtually no miles on them. Only getting an intermittent code 33 High Signal MAF. Cleaned MAF with MAF cleaner. I carefully checked for vacuum leaks with carb/choke cleaner around the intake base, throttle body, runners and plenum and did not notice an idle surge. Also, to further isolate I unhooked all the vacuum lines and plugged them off with bolts just trying to limit the potential for vacuum leaks. The CTS is reporting to my computer program (WinALDL) the correct temperature. Unfortunately, I am just not familiar with the various data coming from the ECM to my program to properly interpret the data to help ID a problem. The MAF is showing almost 15grams of air at idle and it is my understanding it should be around 5 at idle. Here is a video for now, but I will replace it tomorrow after I make a new video. Thanks for taking a look and I appreciate your thoughts and ideas.