I have a intermittent stalling, usually at hwy speeds jump on the gas and truck falls on its @@@@ back off on throttle and get back on it and it's back. Very dangerous when passing with trailer. A search leads me to IPR & ICP as a possible starting point. Is there a easy way to test these components ? I have recently replac d the cps think that could be it but no change, not sure if a replaced a bad one with a bad one. No other issues, truck starts and runs smooth other then the driving blackouts.