The guys on here are going to scream at me for saying this, but here goes.

When I was having engine trouble with a Ford Escape and couldn't diagnose it myself, I brought it to a Ford dealership to diagnose. Their quote for the work was over $700, as indicated on their itemized quote. I told them I couldn't afford the repairs at that time, but that I'd be back. I paid them the $90 diagnostic fee and left a happy man.

So, for $90 I found out I needed coil packs and a specific vacuum line that I would have never found.

I then went online and ordered new plugs, coils packs, and the vacuum line specified on the quote. For under $150 I purchased all the parts and installed them myself.

Just food for thought.