I have an 07 f150 v8 5.4 and it idles very rough. When i start it it seems to start reallut it y rough and just about everytime im stopped its shaking just enough to annoy me. Do you think its the spark plugs? I took into the dealer about a month ago and they said everything was fine. But its still doing the same thing. Also the A/C tottaly sucks is that they way it is? I live in los angeles and it gets 120+ deg in the summer is there anyway to fix that? When i accelerate the cold air gets kinda warm and it doesn't get cold until i get up to speed.