I have a 94 chevy silverado with a 305 v8 had it go down day 2 of buying it mech said it had jumped time. he changed the chain gears and plugs and wires and dis cap and rotar still won't start paid 200 still won't start brought it home to try to fix it myself it blowes fire out the throttle at me. The pump is pumping and sending it makes it through the filter and out the injecters IT HAS GAS I believe the fire is good to. And I think it is timed OK please HELP what am I missing
