1999 Ford Expedition Questions

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I took the 4.6 out of my expedition and put a 4.6 out of a mercury cougar and it will turn over but will not run
Yesterday leaving my house started the truck put in drive and when I pushed the gas it drove but rpm was high and it was not catching speed. Checked transmission fluid. Was low so added fluid. Tried to drive again did...
Has been twice already each time using different brands, the guide seems to just break off and fall into oil pan, bolts are still on engine
slipping and grabing,during this sensation there is a increase in the R.P.M. and also the check engine light comes on
Makes sound on first start up only after that sound go's away,Changed out both idler pulley, belt tensioner, and belt but sound is still there I did get a P0171 fixed that but sound stayed
I have put on new tires smaller size back to stock size new lower ball joints on both sides and the loud popping noise got worse and more often with the smaller tires?
I just bought it like a week ago... Now the check engine light just came on....
I was advised that it is my intake manifold and should be replaced as soon as possible. I do believe it is an EXTREMELY SEVERE Leak as I am putting in oil as fast as it comes out. It is hard in today's world to know ...