A friend of mine was telling me how sometimes as he is driving,or changing gears while backing up,or going forward his truck won't move. Rpm's go up then the tranny will engage and then engages and its alright for awhile. truck is a 2004 GMC sierra xtra cab with all the bell and whistles. He has had it to the dealer and no codes show up so i thougt i'd run the issue by the knowledgible people here for some ideas. My friend is religious about care and maintence and does what the dealer and owners manual recommends. Thanks

I've owned this 1990 toyota corolla SR5 for about a year. Recently, the oil pressure warning light starting coming on, but only after driving continously for more than an hour and only while the brake pedal is pressed. I thought maybe it was some short in the wiring, but in conjunction with the oil warning light, it also idles differently, sort of pulsates or revs up on it's on and is a little louder. Drives fine otherwise. I check and change the oil regularly. It has about 135,000 and is due for another timing belt change. Could it be a timing issue? or something worse?