YES your host can have many effects on your rankings.
if you have a .com and want to target uk/fr/de markets then a UK/FR/DE host is mandatory to appear in the country specific pages
if your new host has loads of IP's banned because of spamming, and if you end up on one of those IP's, it might have an effect on your rankings
if your new host is often down, this will definitly have an effect on your rankings
if your new host bans certain spiders to save bandwidth, this may have an effect on selected SE
hope this helps.
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