Hey, I have a 1990 Jeep Wrangler with Fuel Injection and lately it has been loosing power when driving. It is sort of pulsating when doing so. It will slow down then pick up again. I'm wondering as to what could cause this. Also, my engine seems to be covered in a liquid. Could I have a head gasket leak? Also, I can smell gas, but, there are no visible signs of a gas leak. Additional info, it is a 4.2 6cyl. Thanks in advance for the responses!