I have a 2000 XJ 2.5 Petrol and at 2000rpm the car splutters and hesitates and lacks power, I can feel the lack of power up from 2000rpm as well. I have replaced the TPS, cleaned the throttle body, cleaned IAC, replaced both lambda sensors with decent ones, not knock offs. Lambdas helped a bit when replaced but the problem is back now, I am thinking maybe the MAP sensor from reading up on it? But would a dodgy MAP give out this issue? Thanks in advance!!

 

If it's running that bad, it ought to be giving you a check engine light. Have you pulled the trouble codes? They can help you figure out the problem.

 

Clogged cat converter?
As extrashaky said, pull any CEL codes.

 

My check engine light hasn't ever come on and I have had the car since September I have a code reader but not OBD2 reader will this pull the right codes? Sorry I am new to this all thank for the help!