Car stumbles while driving

Hi,

Have you checked fuel pressure? If you haven't a weak pump it can certainly cause this. Also, an engine vacuum leak can cause it.

Do me a favor, first check if there are any vacuum leaks. It's not hard to do. Follow the directions in this link and let me know what you find:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If there are no leaks found, then I would confirm the fuel pressure is within spec. You may have a weak fuel pump. Here is a link that explains in general how this is done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

One other thought is a partially plugged catalytic converter, but let's cross that bridge if the two suggestions aren't helpful.

Take care,

Joe

Thank you very much for the reply. Took it to a garage, he tested the fuel pressure. When it did stall it was good according to the mechanic. No air leaks that I can find. No codes thrown whatsoever. No engine light is on, I know the engine light does work because the coil went out and the light came on and went off when I replaced the coils. Do you have any other ideas of what I can check? When you drive it easy it runs fine? It seems like when you accelerate passing gear that's when it cuts out. I have also replaced the air filter. Thank you

Hi,

It could be related to a partially plugged catalytic converter.

Take a look through this link and let me know if you feel anything mirrors what you experience:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

I will watch for your reply.

Take care,

Joe

I give up, I am taking it to a garage. Thank you.

Hi,

Okay. If you have a chance, let me know what is found. I'm interested in knowing.

Take care,

Joe