Fuel System Issues:
* Fuel Pump: The pump might be weak or failing, unable to supply enough fuel under load (acceleration). It might be working enough to start the engine but not enough to sustain it when more fuel is needed.
* Clogged Fuel Filter: A clogged filter restricts fuel flow, causing similar symptoms to a weak pump.
* Fuel Lines: Cracks, kinks, or blockages in the fuel lines can restrict fuel flow, especially under pressure.
* Carburetor Issues (if applicable): If your CJ7 has a carburetor, several problems could be at play:
* Clogged jets: Restrict fuel flow.
* Diaphragm problems: Affect fuel delivery.
* Improper float level: Leads to insufficient fuel in the bowl.
* Vacuum leaks: Affect carburetor operation.
* Fuel Pressure Regulator (if applicable): A faulty regulator might not maintain the correct fuel pressure.
* Bad Fuel Injectors (if fuel-injected): Clogged or malfunctioning injectors won't deliver fuel consistently.
Ignition System Issues:
* Distributor Cap and Rotor: Worn or damaged components can cause intermittent spark, leading to stalling under load.
* Ignition Coil: A weak coil might produce enough spark at idle but not enough under load.
* Worn Spark Plugs or Wires: These can create a weak spark, leading to misfires and stalling.
* Ignition Module (if applicable): This component can fail and disrupt the ignition system.
Other Potential Issues:
* Vacuum Leaks: Leaks in the vacuum system can disrupt the engine's operation, affecting both fuel and ignition.
* Throttle Position Sensor (TPS) (if fuel-injected): A faulty TPS sends incorrect information to the computer, leading to improper fuel delivery.
* Catalytic Converter (less likely but possible): A severely clogged catalytic converter can cause back pressure, restricting engine breathing and causing stalling.
Troubleshooting Steps:
1. Check for obvious things first: Loose fuel cap, visible fuel leaks.
2. Listen carefully: Is there a sputtering sound from the engine? This might indicate a fuel or ignition problem.
3. Check fuel pressure: This requires a fuel pressure gauge and is a more advanced troubleshooting step.
4. Inspect the fuel filter: It's easy to check and replace.
5. Inspect the spark plugs and wires: Look for signs of wear or damage.
6. Check the distributor cap and rotor (if applicable): Look for cracks or carbon tracking.
Without more specific information about your Jeep, it's impossible to pinpoint the exact cause. Starting with the simpler checks (fuel filter, spark plugs, wires) is a good place to begin. If you're not comfortable working on your Jeep yourself, take it to a mechanic familiar with older Jeeps. They'll have the tools and experience to diagnose the problem effectively.
