The car will for about 5 miles then shut off after waiting to 10 mins it restart and go another couple is the problem crank shaft sensor its a 91 grand prix 23 quad 4?

It's possible the crankshaft position sensor (CKP sensor) is the culprit in your 1991 Pontiac Grand Prix 2.3L Quad 4, given the symptoms you describe (running for a short distance, then shutting off, restarting after a delay). A faulty CKP sensor prevents the engine from receiving the signal it needs to maintain combustion. The delay before restarting suggests the sensor might be getting hot and failing temporarily before it cools down enough to work again.

However, a few other components could cause similar symptoms:

* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, a faulty CMP sensor can interrupt the engine's timing and cause it to stall.

* Fuel Pump: A failing fuel pump might supply insufficient fuel after a short period of running. The delay before restarting could relate to the pump cooling down.

* Ignition System: Problems with the ignition coil, ignition module, or distributor (if equipped) could also lead to intermittent stalling.

* Mass Airflow Sensor (MAF Sensor): A malfunctioning MAF sensor can provide inaccurate air/fuel mixture information, causing the engine to run poorly or shut down.

* Low Fuel Pressure: Could be a failing fuel pump, clogged fuel filter, or other fuel delivery issue.

Before replacing the crankshaft position sensor:

1. Check for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner (even though your car is pre-OBD-II, some scanners may work) or have a mechanic check for any stored trouble codes. This might provide a clue to the problem's source. Older cars don't have OBD-II, but some auto parts stores can still scan them for codes using older tools.

2. Inspect the CKP Sensor: Look for any physical damage to the sensor itself or its wiring harness. A damaged connector can cause intermittent problems.

3. Check Fuel Pressure: Have a mechanic or auto parts store check your fuel pressure. This eliminates a fuel delivery problem.

Replacing the CKP sensor is relatively inexpensive, but diagnosing the *actual* cause first will save you time and money. It's best to have a professional mechanic do a proper diagnosis to pinpoint the root cause and ensure you aren't throwing parts at the problem unnecessarily. Simply replacing the CKP sensor *might* fix the issue, but there's no guarantee without proper diagnosis.