* Low Oil Pressure: This is the most likely culprit given the oil light. The rough running could be a symptom of insufficient lubrication leading to insufficient oil pressure. This could be caused by:
* Low oil level: Check your oil level *immediately*. Add oil if needed, but don't overfill. If the level is low, find out *why* it's low. This could be a leak (check under the car for oil stains), a damaged oil pan, or a serious internal engine problem.
* Oil pump failure: The oil pump might be failing, unable to circulate oil effectively. This is a serious and expensive repair.
* Clogged oil filter: A severely clogged oil filter can restrict oil flow. Change the filter.
* Worn engine bearings: Worn bearings will allow oil to escape, resulting in low pressure. This indicates significant engine wear.
* Overheating: While less likely given the oil light, overheating can also cause rough running and eventual stalling. Check your coolant level. If it's low, you could have a leak in the cooling system. Overheating can damage the engine severely, including potentially causing oil pressure issues.
* Fuel pump or fuel delivery issue: A failing fuel pump could lead to inconsistent fuel delivery, causing rough running, especially after the engine has warmed up. However, this is less likely to directly cause the oil light to illuminate.
What to do IMMEDIATELY:
1. Do NOT drive the car until you've investigated the oil level and pressure. Driving with low oil pressure will severely damage the engine.
2. Check the oil level: This is the most crucial step. Use the dipstick to check the oil level while the engine is cold.
3. Inspect for oil leaks: Look under the car for any signs of oil leaks.
If the oil level is low or you see leaks: Do not drive the car. Have it towed to a mechanic for diagnosis and repair. Ignoring this could lead to catastrophic engine failure, requiring a costly rebuild or replacement.
If the oil level is okay: The problem might still be related to oil pressure (a faulty pump or worn bearings) or another issue entirely. Have a qualified mechanic diagnose the problem before driving the car further. The oil light is a serious warning sign.
This car is old, and several components are likely worn out. The issue could be a combination of factors. Ignoring the problem will almost certainly lead to a more expensive repair later.
