Well my dad took the Van, since its much less practical for me than the Truck, being that I drive between 40-80 miles a day and the Van gets 8-10mpg and drives like crap on the highway.
Here'* our newest item in the driveway if you missed it
Anyway so I have been driving dad'* '95 F-150. I noticed it seems more sluggish than usual, which could be many thing causing that. But The thing that is really go me stumped is this; I noticed today when i came to a stop light the truck acted like it wanted to move, as if i didn't have my foot on the brake hard enough and it rolled forward, so i pushed harder and it stopped. Then again it does it, lurches forward. So i'm like wtf? Put it in every gear (this is a long-ish red light) and it continues to lurch forward every few seconds. even in park it did this. Neutral the motor reved up a couple hundred RPMs.
Light turns green and I continue on my way, paying close attention. All the gauges are looking ok except the water temp looked kinda low. But going 45 mph now and i feel it come out of overdrive like i put my foot down on the pedal for a second. I started counting, its about 8 second period between each time it does this. So i called dad to let him know and see if he knows what it is or if he knew about it. He said turn the defroster off. So i did, and it stopped acting weird. I asked if he knew what it was and he said he doesn't know what would be causing it, he meant to look into it but never did, so he is unsure why it acts the way it does with the defroster on.
Any ideas or experiences similar to this? Why would it rev up like that in intervals?