Need some advice please,MY95 wrx import,idles fine but when stationery and you accelerate to move it wants to cut out,revs drop really low but then on acceleration it catches and it’s fine,also when driving along and acceleration is applied it’s lumpy,jerks backwards and forwards,cleaned map sensor,throttle position sensor,put new fuel filter, MAF has been mapped out,checked all hoses for leaks none found,previous owner said O2 sensor mapped out and that’s why it’s lumpy on low revs,anything I should look at,it’s not a smooth drive
any advice appreciated

I really don’t know if it’s possible or not,I ordered an o2 sensor anyway so going to plug it in see if that makes any difference,ive put newage coil pack that was when it was misfiring, but that’s issue is sorted,it tries to cut out when you push on accelerator.