hey guys i have a 94 gc8 2.0L. recently i start noticing something weird while im doing a pull from 2nd gear all the way up to 5th.. i would start doing the pull around 4k rpm in 2nd gear.... i would feel like a complete shut off/jerked and then split seconds later the speed would catch back up...and does the same thing through out 3rd 4th and 5th gear.... anyone has any clue what im talking about?? i've never experienced this problem before... i just changed out my pcv valve, spark plugs, fuel filter (pcv valve was clogged up, fuel filter was dirty) spark plugs were kind of black when i took them out (didn't do the gapping on the new plugs, just regular NKG laser platinum) any advice or help would be greatly appreciate...

ps, everything is running fine if im just crusing...only happens when im doing pulls.. im running out of ideas.... help please!