i have been having trouble with my car bogging and backfiring through the intake. i have changed the spark plugs checked if the cat was blocked replaced the fuel pump and filter and then it threw the code for lean bank one. i replaced the O2 sensor and cleared the code and it seemed to be running a little better but still bogging and the intake backfiring under load. also it doesnt like to go over approx 4k rpms(no tach but thats my estimate by sound and feel). i plan on changing the plug wires but if that doesnt help i dont know what to do.

its a 96 manual 2.2

any input would be great. i have been struggling with this for a while now and my other car broke so we are stuck with a family of 4 and no car. thanks