I got around the p1381 limp mode and intermittent idle bump down by increasing the idle at the throttle body cable Wheels to 127 RPMs... and open the idle air screw two turns... now no check engine light and runs perfect Except for high idle... Distributor leaks some oil but tolerable...... I put a load on the motor with the AC to bring down the idle so I can shift ...... Vacuum okay alternator okay.... Everything points to the cyp sensor but it's the intermittent idle bump down.. Every 4 seconds or so that makes me wonder if I have more than one problem.... The idol bump down seems to throw the p1381 and leads to limp mode... so as I described before now I am getting around the problem.... Any information would be well appreciated thank you