1988 B2600
 

This truck sat up for about 5 years. I have been driving it for the last 2 years with no problems until lately. It will run fine for about 2 - 3 miles then act like it is out of gas. I can sit for 5 minutes andcrank it and it will run fine for another 2 - 3 miles etc. It will idle without skipping a beat for hours.

I have change gas filter, put additive to remove water, but the problem persists.

Any suggestions will be appreciated.

Thanks

Bill