I'm having a lot of issues with my 2001 VW Jetta 1.8t. It began to Misfire and my check engine light started to blink. There is very little pick up. I just went and bought new spark plugs stuck them in, and now the car will not even fire up. Any suggestions? And does anyone recommend anyone to diagnose whats going on with it, honest reliable affortable? Anything will help.

Ps. Few months back. Brought my car into the shop and got new coil packs and new spark plugs and also MAF because of a broken gasket and oil was getting on to the plugs and coil packs.