I'm asking here because I trust you Buick guys more than the Mustang guys... any help is greatly appreciated in solving the mystery: My Mustang is intermittently stalling but only at very slow speeds. It will run rough, eventually stalling unless I give it some gas. Under the exact same conditions, sometimes it drives great, sometimes not. The Car: 1967 Mustang 289-2 When the symptoms occur, the following apply: Hot or cold engine Full or near empty gas tank or anything in between Driving slow (5-10mph) through parking lots after 1-2 mins Other driving is fine with no issues: Driving at WOT, freeway speed, or around town is fine Stopping at traffic lights with engine in gear no problems Idling in neutral or park no issues What Ive done: Replaced fuel pump and filter Added Seafoam to gas (almost 2 tanks ago) Replaced carburetor with another thats rebuilt and known to be working well on another car Let's hear those ideas! :TU:
Vacuum leak? Timing? Tuneup? If carb is fine and fuel pump is good and happens when cold it can't be vapor lock. My guesses. Scott
Thanks Scott... I'll double check all that stuff this weekend and report the results. The biggest mystery is that it only does it about 1/3 of the time and only under the conditions stated above... so far, anyway.
How about replacing the condenser, if you are still using the original ignition system. Or, I suspect an intermittent short within the distributor.
I have a Pertronix installed. I was planning on recurving the distributor one of these days soon, so maybe I'll have that checked out while it's in the shop. :beers2:
Well that's one answer... unless I want to go home :grin: I live in a gated townhouse complex and I'm about as far away from the front gate as possible.
It's late, so bear with me... brain function isn't quite what it should be. :sleep: It's a low speed problem, correct? Try hooking a vacuum gauge up to the intake manifold and see what that tells you. You should have good vacuum with little, or no gauge flutter. I'm assuming a stock or RV type cam. Sounds to me like you have a fuel problem eliminated, so that leaves timing and ignition. It's intermittent, so I'd guess an electrical problem in the ignition. But also, what mechanical condition is the rest of the engine in? I'd do a compression check.
