I don't know really where to start here, a lot has been said. Seems to be very varying opinions here.....I don't have a lot of experience with motor work and I won't claim that I do but I do however learn very easily in most cases. I pulled and rebuilt this motor (twice due to problems with different non pi short block) with help from my dad but I did most of the work. Definitely a hell of a learning experience, especially when my dad is the "leave well enough alone" type but I couldn't hardly do that with cams, longtubes, built short block, and a motor with 212,000 miles in a very clean truck I got for 3k.

Anyway I really appreciate everyones input here but I am getting mixed signals. It runs pretty good now and the idle sounds wicked, especially with only high flow cats to quiet it down. Its not a real cammy idle by any means but does not sound stock at all. I was under the impression I was getting a very mild cam that only noted increases in low end and a noticeable idle. I have not ruled out other problems but I figured a tune would help the computer accept the setup much better. I will most likely try replacing TPS next and see if it helps, I don't think the part is much anyway. I mean many parts on the truck have over 200,000 miles and they're gonna fail thats just the way it is.

Sorry for the long post just wanted to let you guys know whats going on and youre not giving advice to some ignorant kid who carelessly pulled and rebuilt a motor. I just really enjoy this stuff. Odd that I can't leave stuff alone unlike my dad haha, guess thats just the way I am.

Thanks for the help though guys, I'll try the TPS sometime and most likely eventually get tunes. I've always heard the power performance guys won't give me a tune I don't need anyway so maybe they can shed some light?

 

I hope I gave you some insight to the effects of these changes.
If there were no effects, I would question why make them.
The PCM program can self adjust at up to 20% for fuel and wear as the engine ages but sometimes hardware changes made become out of reach (program limits) without intervention in the program and supporting changes in other hardware to optimize.
The program (software) is 'written' to be a compromise for the application, reliability and overall driveability.
One of the results of this is the ignition timing agression is intentionally made a bit lazy so the motor does not ping under loads with 87 octane fuels.
You would find that there is even a small performance improvement to be had by reprogramming a stock motor's PCM for peaking performance over what the factory program provides.
A little info on my truck. On my completely stock 4.6L with no faults, no air intake mods , no exhaust mods, no codes, perfect starts and drivability, my engine comes on the cam/s at exactly 2000 rpm from a stop and begins to pull good.
At about 32 to 3300 rpm where torque is rated to peak at, it really gets with the show for a 6000 lb pulling small engine.
With 161,000 miles for age it still can get fuel mileages nearly 17 out on the open hilly highways.
Out on the road, if the rpm is kept at just above 2000 in OD the trans does not down shift out of OD with enough engine torque to keep the weight up speed even up long grades. This is again a show of where the cams come in for good power.
Glad you came and asked. It resulted in a good discussion.
Good luck.