I got a 98 catera, with the number 4 injector not working. No signal from the (ecm) . Fuel pressure is good. New coil and spark plugs, wires look good, test good. I'm leaning on it being the ecm. Wanted to see what everybody else thought. No check engine light, but got codes p0304, Pending codes p0300, p0301 p0306 p0303, and p0336. Which or all misfires and crank sensor.