4age bigport timing issue

[dove grey 64]

Car:ae86
engine: 4age big port with tvis stock everything, bit of a mangled loom
issue:
timing retards itself while accelerating, everything has been set properly at tdc etc, if you shut off the engine the timing jumps out by about 30deg and the motor wont restart, you have to turn it twice for the timing to reset to where it should be then it starts fine, idles fine but when you rev the motor the timing retards itself heaps instead of advancing.
things like dizzy ignitor and ecu are all fine and working, all bolts are tight on the cam gears and everything was set properly at tdc.
any ideas? the car feels about as fast as a worn out 4ac

[timbo]

Check your TPS, sounds like something a buggered one would do.