No Start Help!

[4.3LDog]

I just installed new plugs, wires, fuel filter, and seafoamed the engine on my 01 RCLB 4.3 auto 2wd. Truck was running great until last night. I was driving along at highway speed and all of the sudden the engine started to sputter and then immediatly died. I tried restarting it and it acts like it wants to take off but it just wont fire up, and also when I crank it the engine seems to kick every once in a while. When I got it home I looked for anything obvoius (burnt wires, loose conections) and everything was good. I don't think it's a fuel problem cause it smells like gas and the pressure checks out. I then pulled a plug to test it,and no spark. My qestion is, what could be the most likely culprit and what should I test. I don't have any access to a code scanner but I do have a test light.

[plowking]

I've seen plugged catalytic convertors cause vehicle not to run. Did you get any service or check engine lights? Maybe the sea foam loosened some crap out the tailpipe. Fuel filter was installed wth arrow toward engine? O2sensor ? I'm just guessin' since no one else has replied. plowking