I have a Tacoma and, when starting it in the mornings, the oil pressure raises to 70 lbs. But when the temperature reaches its normal range, the pressure drops to 10 lbs. When accelerating it to 5000 rpm, pressure only raises until 30lbs. I am a mechanic myself and have already checked everything, bearings, rods and even camshaft and they are alright. I've changed the oil pump but still cannot find where the oil pressure might be escaping. Does someone know which is the secret with this van's engine?

I have my tacoma with 96000 mile in it. Got it maintenance at a local toyota service center. They replaced spark plugs. After a few weeks I noticed that between 40 to 60 miles per hour my truck had a jerking or hesitation move. I physical check the 6 plugs...maybe it wasn't gapped correctly but they were. Also checked ingintion coils to see if they were burned or had any oil around...also looked fine except one of them was marked with an x in yellow. Scanned it as well an everything checks out or no engine light has turned on. What else could it be??

Check with scanner it show me P0301. I ready check coil ,spark plugs what else could be