Sunday, December 11th, 2022 AT 12:51 PM
While warming, the engine revs and drops every 2 to 3 seconds repetitively, but when warm, the engine idles normally. Just had U tube above header replaced when Ammco performed valve cover replacement. Said only U tube cracked and needed to be replaced. Checked, and there were no vacuum leaks. Actually started problem after another shop replaced struts with Monroe Quickstruts, sway bar linkages, control arms, and rear shocks. This should have nothing to do with vacuum hoses or header work by Ammco).