5.4 miss on acceleration

[9ENGEL]

Greetings

Company just bought a 99 E350 5.4. Around town it seems fine, but at about 55mph+ it stumbles a little as I acclerate. Crusing at 65mph it runs smooth until it needs a little more peddle, like starting up a hill.

I noticed the trans cooler was leaking and that the trans fluid was low(in the cold range while it was up to temp), so my first thought was the trans slipping a bit. But my research here points to coil packs possibly.

Any help with diagnostics would be great as I haven't been under the hood of anything with spark plugs in quite awhile.

TIA

[Sancho]

The connections from the coil packs to the plugs get corrosion. For more info ,try f150 online.

[9ENGEL]

Thanks Sancho

I put a 1/2 qt of trans fluid in and tightend up the hoses at the trans cooler that were leaking, then took it back on the highway, no more missing.

Now I'm throughly confused.