Hey Guys. I had posted my issue last year and I'm still trying to figure it out. 1991, D150 360 MPI, automatic. On cold start and running for 5-10 minutes or so, it runs great. After it has warmed up and the longer it runs, if I get into the pedal, it simply bogs down. Like it's leaning out. The longer I drive, the worse it gets. Just can't give it gas under load. However, when I shut it down and immediately start it back up again, it will run fine for a bit, but eventually the problem returns. I checked for codes onboard, as well as with an OTC scanner and none show up. Just 12 and 55, which is normal. Any ideas, guys?? I'm lost. Oh, as a side note, on first start up after sitting in my garage all winter, it actually ran perfectly for 2 weeks straight. I was thrilled, but one day, the problem simply reappeared and has not gone away.