3.0 engine car will not rev over 3k rpms . Replaced o2 sensor had a code for it replaced brake booster line no more vacum leaks ,cleaned maf sensor getting engine runnig rich code and replaced spark plugs with bosch platinum .
HELP..........

 

replace upper and lower intake manifold gaskets, usual problem for X-type

 

replaced upper gaskets , I forgot to mention that I didn't clear the codes after I changed the o2 sensor . I had the code cleared and ran the car on the road for about 20 minutes it seems to be be running ok now but I been down that road before .
Thanks for the reply .