Thought this would be useful as the question is often asked...
Before you carry out this little task it is vital the engine is at full working temp as our cars run at a few degrees of advance until warmed up,
To set/check your ignition timing. (Courtesy of Turblio)
Run engine to normal temperature,
Stop engine,
Disconnect TPS,
Restart engine and rev it to 3500 rpm 3 or 4 times (this puts the ecu into timing reset mode I have been told)
connect timing light
you want the 20 degree mark (right hand side mark)
move dizzy so the correct mark lines up with the pointer
stop engine
reconnect TPS
restart engine and road test should be better than before
listen for pinking, if you are not using a high octane fuel you may need to back the timing off to about 18 degrees
and that is it hope this helps
Frank
ps the TPS plug can be found under the right hand side of the top mount
sometimes attached to a black retaining clip