HI I am new to this site, I am looking to purchase my first diesel truck. The one I am looking at is a 95' F350 CC LB 4x4 PSD. It has 250,000 mi. and looks to be in fairly good condition. The guy who is selling it says it may need an injector. I asked why he thought so he said the engine shutters like there is a miss in it. He also said the the transfer case was kind of hard to engage but work fine once it was. He's only asking $3,000 for the truck and my questions are: could an injector going out (or out) cause the 7.3 to shutter or could it something else, and could there be anything major wrong with it? And what could cause the transfer case to be rough to engage.(manual transfer case). I'm no dummy to mechanics but no wiz either so you can be pretty technical if you have to be. I am new to diesel engines though as far as the innner mechanics and functions so any info would be greatly apreciated thanks.