when i start the car the idle hangs at like 1500 or so then drops to about 1k-900 (idle)... this is just the engine building the oil pressure right? because when im parking the car and put it in Park the idle goes back up and takes a sec or to to get back to idle.. then when i shut the car off its like a friggen diesel and i can honestly take the key out and have both my feet outta the car before it turns off... what u guys think?