My 95' 3000GT started skipping after the engine warms up if I'm going up hill or under a load. It feels electrical, not mechanical. Looking for some direction, I'm thinking Tune-Up but i just pulled a plug from the front side and Plug Wire and Spark Plug look pretty good. I know there are...

1995’ 3000GT SL, was running great. Cruising down the highway i push the gas putting load on the engine in 5th of gear it seems to be skipping a little as I speed up. any ideas? Total Rebuilt engine some 3000 miles ago with a tune up athough it’s been 5-6 years. Thanks, Jack