The car has 85k and is mostly stock was completely stock till i got it back in jan. it seems like when you cruise around it will have trouble if you punch it kinda like its bogging and if you watch the tach its jumpy. I cleaned the MAF and that did not seem to do anything a couple weeks ago. Yesterday changed the IAC and the TPS and it feels better to were now at WOT it will take off were as before it would stumble but sometimes it still feels like its bogging and the RPMs are jumpy but will eventually take off. My check engine light has not came on or flashed but does work. when i first got the car it did not have this problem. So far i have changed the fuel filter, new MSD cap and rotor, ford racing 9mm wires, autolight 24 gaped at 54 ( the problem was before the tune up i thought it would help since from the looks of everything all the parts were still oem the plugs looked good), new 02 sensors along with a 2.5 off road h pipe flowmasters and 2.5 tail pipes ( cant have a quiet 5.0 and got the h pipe for free), and i added a 70mm bbk tb (i think the po of the tb might have adjusted the set screw is there anyway for me to reset it?) the car does not appear to have any vac leaks. Thats all i can think of at the moment thanks