When driving lately with foot steady in gas my RPMs will drop from say 1800 down to about 1000 and power decreases as well. if I keep my foot on gas at steady rate the vehicle will not recover back upto 1800 for example. No codes triggered but it seems similar to an issue a few months ago but the engine would start running rough and then if would recover same thing though where loss if power occurred. That turned to be a coil pack on cylinder 5. Any thoughts on what's causing Rpms and power to drop? Coil pack again on different cylinder maybe?How do you test which pack is bad if code hasn't triggered? 1999 cruiser with almost 190k on it
