Slow crankin starter

[jaguar02]

1995 xj6 with 100k pampered miles,,regular oil changes etc....occasionally will start then stall,,upon trying to start again it cranks slow as if the battery is dying,,then starts after a fewe attempts,,I noticed teh firewall battery connection needed the nylon spacers replaced which I did and retightened,,it has happend twice again in three weeks,,any Ideas??

Thanks

[agent#1]

Sounds like the timing might be off. Or if it runs untill warmed up and then dies, the timing might not be advancing properly.