My clutch started slipping last summer at around 130000 miles, so I figured it was time to get a new clutch. The autoshop confirmed that the clutch was at fault so there installed a new clutch kit for way too much money. I picked up the car and drove it around for a while on a tight new clutch (very different feeling). Anyway, it's been a few months (I drive a ton) and now during hard accelerations at about 4-5 rpm the car will jerk really (really) hard, and stop accelerating. It's different feeling than when the clutch was slipping which was a lot more gradual and calm.
Possibility?: The autoplace handed me some sort of arm like thing thats supposed to attach the transmission to the frame and said they couldn't get it on. He said it's not necessary so I put it in a drawer in my room.
Also the check engine light turned on the first time it happened and never ever turns off.