I just had my engine swapped in my car, ran fine had the oxygen sensor replaced basically general maintenance on the car. But the car is running weird. When I start it up it idles fine. When I take it down the road and start to accelerate the car starts bucking as I increase the gas, the bucking feels as if the car has bad gas and the car immediately acts like its going to shut off. I had changed all of the fuel injectors, spark plugs, rotor, basically thrown money at this car to see what it is even changed the fuel filter, no dice. I can drive it down the road increasing speed very slowly it wont buck. but as soon as I give it more gas to increase speed she acts crazy, has any had this problem before.Looking for help

 

Have you checked the distributor cap and plug wires for leaks?

 

if those check out, check fuel pressure

 

The spark plug wires, spark plug and cap and rotor are new. How do you check fuel pressure?