Car shudders at 2kRPM Options

[cyborg]

Hey, got a problem with my celica, if i hold the car at a steady rev of about 2k RPM the car judders back and forth like its about to stall, but doesn't and just judders violently (similar effect to if you tap the accelerator on and off) My friend suggested its the throttle position sensor, think that sounds right?

I've recently changed distrubution cap, rotary arm, spark plugs and HT leads. Problem persists, and can give a bad flat spot when reving.

[cyborg]

Well since no one has replied i'll update, I done a self dianosis with the car (with a guide i found somewhere on here, which involved a paper clip and watching the engine light flash) and it has told me that both my throttle position sensor and speed sensor(seems like a crank sensor) has an error code logged.

Anyone know of any online shops (for uk) who sell these?

Im going to give http://www.probedistributors.co.uk/ a ring tomorrow about it as their website is terrible but suggests you can get it there.