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What causes your rpms to lower up and down with brake on and in gear also almost stall when slowing down or stoped and also when ac is turned on i changed egr pcv hose and valve iacv fuelfilter?
Wiki User
∙ 13y ago
I think I'd start looking for vaccum leaks. New cars are much more reliant on strong vaccum than old clunkers. When you punch the brake pedal, the vaccum powered brake booster can steal needed vaccum from other systems in the car (i.e. fuel delivery or vaccum advance type ignition). In some old caddilacs a small vaccum leak can cause the flapper valves in the climate control system to go all nutty.
With the engine running, spray a mist of lps1 on suspect vaccum lines. Where there is a vaccum leak the liquid will dry rapidly off of the hose. Alternately you can flex some hoses around and listen for sucking sounds when you move them. Replace all leaky or cracked hoses.
Wiki User
∙ 13y ago
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