[quote:5353ae4811="det"]Engine Performance problem
1972 Ford E-Series Van V8 Two Wheel Drive Automatic 80000 miles
My 1972 Ford E200 Van surges and idles rough in drive but only when stopped In park or neutral it idles perfect "surges and idles rough in drive but only when stopped In park or neutral it idles perfect[/quote:5353ae4811]
Check for vacuum leaks. Loose vacuum line hose or one that's cracked/split & also where the carburetor meets the intake manifold & where the intake meets the heads. If the vacuum lines are good, you can spray a little bit of carb cleaner or WD-40 around the manifold joints while the engine's running & if the idle changes suddenly, you just found a leak.
The engine's not under load in Park of Neutral, so what shows up when the vehicle's in Drive often doesn't show up in P or N.
Sep 18, 2009 at 3:57 PM
