1995 Chevy Astro Astro starts late, rides rough, smells, ba

1. Starting - I've already had to replace the starter as it takes a good 30 seconds to start it and burned through one (although starts GREAT in the freezing cold).
2. Mileage - FIgure I'm around 5-8mpg. IT was never great, but man.
3. Smells - Exhaust smell is prevalent, and it's a very fuel heavy smell. People complain about me. One lady said I was killing her baby as I idled next to her.
4. Rough - Idling is horrible, definitely sounds like it's gonna die any second, but actually never does, just runs crappy.
5. Kicks back - when driving sometimes it's kicking back like crazy "pop, pop, pop". Have to gun it to clear it out and get it moving.


What�s been done/checked

Massive amounts of fuel injector cleaner (over time)
Tune up replacing all wires, cap/rotor, plugs, oil
Replaced MAPP sensor
Took apart and cleaned carbon from EGR
Ran Seafoam treatment (all three ways)
Tweaked up Idle