I have a 1983 Camaro Cross Fire Injection. The car had been running fine, then it got to where it would accelerate. It would backfire up through the breather and not open up. I replaced the O2 sensor and the fuel filter but it did not help. Then it got to where it wouldn't start. A new set of plugs got it to start again but it still will not open up. I had a mechanic to check it out and he said my catalytic converter was stopped up and he cut the exhaust off in front of the converter. It still has the same problem but he said that once i got a new converter put on, it should fix the problem because it did not have any back pressure with the exhaust cut off. I asked if he checked the fuel pump pressure and he said he did. It had just enough pressure at idle, but when accelerated, it lost all pressure. He said this was due to no back pressure. Is this the case or is the fuel pump on my car in need of replacement?
Thanks.