Replaced an broken exhaust manifold and now my truck runs rough.

Replaced and checked wires and plugs. It misses only when accelerating at a steady speed, if I give it more gas it seems to clear itself out. Just getting frustrated as to what is causing it. Thanks for your advice.

Look around... Possible vacuum leak.... Got to be related to manifold swap!

Thank you so much for your advice... I would not have dug further add you not made your comments to ideas that could have caused it. I did finally figure it out and wanted to let you know just in case you ever came across this question again, I ended up replacing the back bolt on the exhaust manifold was threaded incorrectly and caused a small vacuum leak I am assuming. Crazy but no more problems.

Good deal.