General Lumpy running

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General Lumpy running

carderv

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Joined
Oct 22, 2015
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Location
omagh n.ireland
Need some help...when i start my 2007 1.9 it runs very lumpy..after about 20 mins or so once the temp gauge its the first white line it settles down and runs great..but...once the temp rises and i put fan on for a bit if heat themp drops realy quick and it starts with the lumpy running again.....could this be the thermostat...TIA
 
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