my efi tr magna misfires mainly after going up or down hills or sudden stops(it eventually comes good after a while). on the highway no dramas. does this sound like i've got crap floating around in tank or perhaps a fuel filter problem.also is there a filter in the tank or anywhere before the petrol reaches the one in the engine bay. any words of wisdom would be greatly appreciated.

Does the check engine light come on?

yes occassionally on and off

Your in luck, the fault can easily be diagnosed!

The code can be read with a LED test light or high impedence (Min 1 megohm) analogue volt meter.

The pulses are displayed as a series of long and short pulses. To identify the the code number, note the number of long and short pulses. One long pulse followed by 4 short pulses is code 14. If more than one code exists they will be displayed in numerical order with a pause in between. If no faults are present a continuous series of short pulses will be displayed.

To Test

Connect the negative lead of the test equipment to pin 12 and the postive lead to pin 1 and turn ignition on. Read codes.

Engine ECU Codes

11 Oxygen sensor circuit
12 Air flow sensor
13 Intake air temperature sensor
14 Throttle position sensor
21 Coolant temp sensor
22 Crank angle sensor
23 No 1 cylinder TDC sensor
23 Vehicle speed sensor
25 Atmospheric pressure sensor
31 knock sensor
36 Ignition timing
41 fuel injectors

http://www.aussiemagna.com/forums/attachment.php?attachmentid=9762&d=1115373681

My problems were MAF and Injectors, both were fixed by cleaning the connectors with contact cleaner.

cheers i'll get my sparky mate to help me.