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hi,
You should not move the source of vacuum from the distributor advance, as its normal source is generally a 'ported' vacuum port, which acts to increase the vacuum gradually as the revs/load increases. Moving it may cause funny things to happen.
Also if your car has low vacuum and is backfiring though the intake manifold, the distributor may be off a tooth, sparking while the intake valve is open. This can (i think?) also be caused by (gulp) a slipped timing belt; you should verify the cam timing before proceeding.
regards
__________________
Brendan Schlenker
'83 GTV6 ~ '87 Milano Verde ~ '89 Milano Verde ~ '87 BMW 325iS
Last edited by Brendan_LS; 11-05-2009 at 07:03 PM.
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