A couple of years ago, I replaced the brake booster on our 2007 MKX. At the same time I replaced coils and plugs. I removed the intake to facilitate an easier install of all elements. I purchased the coil/plug kit from Tasca and received new intake gaskets which I installed when putting everything back together. The car has 200,000 plus miles on it, but ran fine prior to booster failure. Now I can start the car and let it warm up. When it reaches a temperature that would initiate the cooling fan, it starts a rough idle. Sounds like, chug, chug, chug, chug...Starting vehicle is normal, initially idles up, then settles down to the 6-700 rpm range and idles smoothly, then as the temp reaches that critical point it begins to get rough, lowers to the 4-500 range and may actually die. If I restart, it's in the "chugging" mode and every so often I will have to tap the accelerator to keep it from dying. Since this happened, I have replaced the MAS, the purge valve and the PCV valve. We would like to sell the car, and outside of this issue, it's a pretty nice car. Any suggestions or similar experiences?
