This is the scanner I use now and also worked with my old '95 3.4L:
Autoxray EZ-Scan 6000

AutoXrayŽ

 

The hose on top of the motor gets hot from the engine and stretches over time. Dealer sells them for $13 or just get a clamp on it. check and see it your ac compressor pulley is stiff. Mine couldn't turn over when i first got it,ended up being a easy fix. There's a belt that fits without having to buy a ac bypass pulley.

 

I had oil overfilled about 2qt once and white smoke... and it had effectively a blown head gasket... apparently in early stages (or right after oild change) water/coolant in oil can all look like oil (very thin) until it becomes white and your oil cap starts looking like pudding. Check your oil cap for signs of condensation/foam or anything that can look wet or dirty. With watery oil your oil pressure can drop a lot. Also check if your coolant is oily, when engine is cold open radiator cap carefully (do first half twist counterclock wise to release preassure, if any) and check for any signs of oil. If you have a blown HG and want to sell it, please do an oil change and and a coolant+oil treatment for blown head gasket and sell it to a dealer or trade it in, not to another person not very educated in mechanic like me who will find out they put their savings in a junk... i'll do the same if i give up fixing mine, lol. Hope i had been of any help.