Ok, so I have an '87 Ram50 with a 2.0. I saw that there was a threaded hole on the side of the block just below the starter and it was spewing oil. I had no clue what the hole was for, so I grabbed a 1.5" long bolt from the parts store. I thought it might be a little long, but it was the shortest they had. I threaded it in and it went in smooth and easy all the way. I tried to fire my truck up and it cranked over really slow. Immediately I pulled the bolt back out and tried to fire it up again. It took some time but I finally got it to fire up and drove it home. The engine is shaking pretty bad and it feels like I am pulling a couple of extra tons of weight. It's kinda like my e brake is stuck on. Feels like the engine still has some power, but something is dragging it down. Well I found a manual and it looks like a short plug goes in that hole and you're supposed to stick a screwdriver in it when you do the timing. I just did the timing last weekend after my belt tensioner broke and never stuck a screwdriver in that hole. I guess my question is, what's the hole for, what did i screw up by sticking that bolt in there, then trying to start it? What do I do about it, and what the heck is a silent shaft?