hmm i had this problem with my jeep in the summertime only at idle it would drop to about 10 psi and then go up to about 40 at about 2000 rpm. i was told it was fine that all the sending units read wrong under high humidity. about a month after that my engine started making a ticking noise that no oil will get rid of and it also has piston slap now.

WHEN THE ROAD ENDS, THE FUN BEGINS

97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs