[mochie53]

95 Bonne stalls while idling or driving. RPM drops, stumbles,and stalls. Ocassionally will recover and race (3000 RPM) before settling down. After stalling, takes a few trys to get stabilized, each time motor runs longer.
Measured fuel pressure - OK. Problem also occurs with gas cap off.
Removed fuel tank, drained, changed pump & sock + filter. No TROUBLE codes. Also replaced pressure regulator. Occurs with any fuel level or engine thermal condition. When it runs, it runs fine. Manifold vacuum is good.

After stalling, can bleed air out of pressure regulator. Connected a clear hose to regulator return and see a stream of air bubbles. Is this normal ?
Where could air be coming from ?

If air is not the cause, suspect an ignition problem.

Comments appreciated.