Q: Car stalls, hesitates, misfires - 1998 Oldsmobile Delta 88

asked by on September 26, 2016

I have an intermittent problems with my car stalling and hesitating. It backfires ocassionally as well. However, I've noticed these issues are occurring with an increasing frequency. I had the codes read and the lean code came up along with the misfire code. Due to the lean code, I had the fuel pressure checked. One time I got 17 PSI. I had the fuel filter replaced. It didn't solve the issues. This continued to happen even when I had the fuel regulator replaced. I had the fuel pump replaced also. However, the car kept hesitating and misfiring. What should I do to fix this?

There are several potential problem areas (besides fuel supply which you seem to have addressed), which could cause lean running and the symptoms you describe. A dirty throttle body, failing mass air flow sensor, vacuum leak, or bad oxygen sensor could cause this problem. First check for problem codes stored in the engine management which might indicate the component area to investigate next. A certified professional from YourMechanic can come to your car’s location to diagnose the stalling and misfiring problems and determine what is needed to get the car back on the road.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Violent surging from rough idle after cleaning throttle body and putting in gas

Hello and thank you for contacting YourMechanic. You may want to perform a tune-up and change all of the spark plugs and wires first. Then check for vacuum leaks on the engine with a vacuum gauge. If the vacuum gauge...

Battery group size

Hi, thanks for writing in. The main thing to keep in mind when it comes to battery group sizes is its physical size. The cold cranking amps (CCA) is what is important when it comes to the battery's ability to...

How much to replace an automatic transmission to a manual

The PCM and TCM that you presently have are incompatible with a manual transmission. The PCM hardware and some engine controls, particularly relating to idle speed and electronic "dashpot", would be different too. The only way you could reliably do...

Related articles

How Can Problems with the Ignition System Cause Misfiring?
Misfires Misfires are never good, and they're always a sign that there’s a problem with the engine that needs to be repaired. The problem won’t “go away on its own” and waiting too long can cause the situation to grow...
10 Biggest Car-Related Headaches and What to Do About Them
You You don’t want to, but if you're a car owner it's inevitable that at some point you will experience car troubles. It's also fairly certain that the machine you rely on will cause you grief when you least expect...
Is it Safe to Drive With a Misfiring Engine?
Repairing a misfiring engine can be simple or complicated, depending on the reason it is misfiring. The most common causes of engine misfires are:...