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putting a 172 engine in your car will probably make it uninsurable for you, or at the least it will be more than a normal 172, oh and dont even think about not telling them if you put it in
they are very lumpy,mine did the same as yours, i found that putting optimax in made mine run alot better (i know its contreversial but it did it for me !!)
ps there not just lumpy when cold, there lumpy all the time because of the cams