91 LS400 stumbling, jolting after 3k rpm
 

The car was having idling issues, cleaned the MAF and that fixed that so far. Just did an oil change and felt eager to floor it which I did, come to find out I unveiled a new problem. The car does not wanna go past 3k rpm, as it stumbles and jolts when accelerating hard. What could this be? Only had cel’s for missing o2 sensor and the MAF sensor which I cleaned out. doesn’t show any codes now