I have a 2001 ranger 4.0 v6 I have replaced the idle controle valve and plugs and wires and the throttle position sensor and cleaned throttle plate and have run sea foam threw it no codes come up when I go to break. At a stop light or stop sign the rpms go up a little then down idk if that's a sign of a brake booster vacum leak I sprayed carb cleaner around the opening from break booster and nothing any ideas and I'm only getting 11 mpg right now I did clean the egr as well my ranger is 4wd and has a 6 inch superlift so it would lessin the mpgs a little but isent that a little low
May 22, 2012 at 8:34 PM