To tell the truth I'm just guessing here. About 3 years ago I started having a bogging problem occasionally when starting to accelerate. It would go away when I shifted to 2nd. It got worse over the years and now doesn't want to idle. Starts good but I have to play with the gas to keep it running but after about a minute it quits. Starts right back up but keeps doing the same thing. I thought it wasn't getting enough fuel so I changed the pump and filter which made no difference. I'm in the process of replacing manifold gasket so I haven't been able to see if that made any difference or not. I did clean the IAT sensor too.