__________________________________________

"Sean" wrote:

305 TBI hesitates at light throttle similar to bad
accelerator pump in carb-equipped car.

Idles super smooth.
MAP sensor swapped with a known good one.
No obvious vacuum leaks.
Goes nicely from lean to rich when I nail the throttle.
Cat convertor clogged? It's the original.
Plugs/wires? Not that old.
Knock sensor bad?

Any ideas?

__________________________________________

These are guesses of some items to investigate:

1.) Throttle position sensor worn/erratic near idle position.
2.) Idle Air Control actuator slow to respond or sticking.
3.) MAP sensor slow to respond.
4.) EGR valve defective.

Can't think of more. Good luck.

Wendy & John.
___________________________________________

Be careful you do not get mislead on the EGR valve's not holding a vacuum.
Some of these things need exhaust pressure to seat an internal port before
they will hold vacuum.

"Sean" <not.givens (AT) spam_not2018 (DOT) org> wrote