Hard to start, 2 months ago bogged down in traffic, gas to the floor wouldnt go. replaced fuel filter. still hard to start then driving it missed 2 or 3 times then the engine did the same thing. changed the air filter it started i drove it about 30 miles then it started cutting out again. put in shop replaced plug wires, crank sensor, checked fuel pump pressure it was ok. need help still doing the same thing