My truck sat for 3 weeks when i got back to it it started fine but 5 minutes down the road it stalled while going 60 miles an hour it statrted right up and the it ran rough a littlle while later like a coil was going bad but cleared up quickly the i step on the gas and it reb up like it was in gear but quickly cleared up then when i got home i put seafoam in it and filled it up and ran it for about ten mile and it rebbed up again and rain rough .

What are your suggestions