Car ran well after adjusting timing but not anymore..

[Scrubb]

Been having a few problems with the timing on the car..

I set the timing a couple of weeks ago and found that it had been like 20 degrees the wrong way for months and months without realising (I just thought thats how the car was meant to run)

Car was much better as I decribed on other thread here:

http://www.oldschool.co.nz/phpbb/viewto ... ght=timing

But the car has been bunnyhopping and jerking when I drive it and found that when I checked the timing it would be back at 0 degrees or something and not where it should be (5 BTDC)

I've corrected the timing about 3 times in the last week and a bit but the car is driving NO WAY as good as it did when I did the timing the first time, its just like it was when it was completely out but a bit smoother and a bit more power but not as good as the first time.

I disconnected the vacum hose from the distributor and blocked it off with timing light and increased the engine speed and the timing went from 5 to 0 and then jumped sharply up to 10 or 20 or so when I further increased engine speed. I also got my brother to suck on the vacuum hose and the timing also advanced about 5 degrees.

This is all the info I know so far.. replacing belts and tensioners tomorrow hopefully if the belts and tensioners I got are the right ones.

Does the timing advance sound like its working okay and does anyone have any ideas what could be causing it to still run like shit when I adjust timing when I havent changed anything since the first time?

Any help or ideas will be appreciated.. I'm eager to learn this stuff..