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1995 Chevy Caprice 4.3 engine stop firing after runs about 30 mins. and 15 mins later it would restart once again.?

Here are some possible causes for your 1995 Chevy Caprice 4.3 engine to stop firing after running for about 30 minutes and then restart after 15 minutes:

1.Fuel injector issue

*Fuel injectors could be clogged or faulty. When the engine is cold, the fuel mixture may be rich enough to allow the engine to run, but as it warms up, the leaner mixture causes it to stall.

2.Ignition system problem

* Ignition components, such as spark plugs, spark plug wires, or the ignition coil, may be faulty, causing intermittent spark or weak spark when the engine is hot.

3.Faulty temperature sensor

* A faulty temperature sensor can provide incorrect information to the engine control module (ECM), which can lead to improper fuel and air mixture, causing stalling when the engine reaches a certain temperature.

4.Vacuum leak

*A vacuum leak can cause a lean fuel mixture, especially when the engine is warm, leading to stalling.

5.Fuel pump problem

*A weak or failing fuel pump may not be able to deliver enough fuel to the engine when it is warm.

6. Computer sensor issue

* Sensors such as the oxygen sensor, crankshaft position sensor, or the throttle position sensor could be faulty, providing incorrect signals to the ECM.

7. Catalytic converter problem

* A clogged or faulty catalytic converter can cause the engine to stall when hot due to excessive exhaust restriction.

8. Electronic control module issue

*The ECM may have a software glitch that causes the engine to stall under certain conditions.

*To diagnose the exact cause, it is recommended to have a qualified mechanic troubleshoot the issue using diagnostic tools. Some issues can be diagnosed by using an onboard diagnostics (OBD) scanner, which can provide error codes related to the problem.