Just acquired an 84 Seville, 4.1L gas, 51,000 miles, garage kept, oil chgs every 6 months, previous owner always used unleaded premium. Throttle response is good when engine is cold, however, once warmed up begins to hesitate during first inch or so of gas pedal travel - once past that point, it runs smoothly but initial acceleration or accelerating after turning a corner, engine stumbles until you press harder on the pedal. The warmer the engine is, the more it hesitates. I've used three bottles of F.I. cleaner so far. Is this a vacuum leak or a clogged something? Hopefully it's an easy fix. (BTW, Tuffy in Ft. Myers said, "oh, they all run this way!", I don't believe them for a minute!).
It's pretty easy, but first here's what I'd do: buy a can of carb. cleaner, remove the MAP hose at the throttle body and spray a ton of it in the port through the can's little red extension. That'll probably get most of it. Otherwise, you'll need to disconnect the fuel lines (no big deal) and remove 3 bolts.
Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
Re: 84 Seville - low speed hesitation
We must first assume he knows what a MAP hose connection is. If he does not then a technician should ck it. I would also verify the TPS is set correctly or is not open electrically at that warm throttle angle. Both these items can be monitored thru on board diagnostics assuming one has the factory service manual.