i was driving down the road today after having a rod replaced last week....

and then today the car just started having spasms, the tach dropped to 500rpm and started spassing while i was going about 40mph the needle jumped up and down but then went back to normal...any ideas, this isnt the same as the erratic idle (which by the way i narrowed down to a bad alt)

could it be the fuel pump spassing out? this is really the last thing im gonna fix...its time to sell her....hows the dependability for the rest of you guys...ever since i got this car ive had nothing but problems.....its a bluebird sss with stock na sr20 motor

thanx