Engine Performance problem
1989 Dodge Dynasty 4 cyl Front Wheel Drive Automatic 155000 miles
my dodge dynasty starts then dies. We've changed cam shaft, emptied gas tank and replaced with new gas treatment and gas, changed fuel filter, gets fuel to throttle body, checked spark plugs, checked timing beltm, runs a few seconds longer by manually pouring gas into throttle body, done code check- no codes, can hear fuel pump kick in, took out catalyic convertor, checked fuses, replaced fuel pressure regulator. What could be the problem?