I recently got a 4.6 Cougar and it seems to have a few issues. When I give it full throttle from a standstill, it will studder getting to about 4500 RPM and shift. Also if I'm moving then try to kick it down, it takes longer than expecting and repeats shifting issue. I have full transmission fluid. Checked when running. It didn't smell burnt. From what I've read it could be the TPS. Any input?