Car stalls and chugs when not accelerating

There are numerous things that will cause this problem. If the check engine light is on, have the codes checked to see if there is a problem the computer has found to cause this issue. Even without the check engine light on, there may be a code stored. You can also do a visual inspection under the hood for any disconnected hoses causing vacuum leaks. These are the best places to begin with diagnostics

You do not find any vehicle problems
guessing or asking someone

You have to do the proper testing of the vehicle

Most people go to a local shop & some throw away
extra money for the same service at a dealer

I doubt it. You should have the computer checked for trouble codes.
It could be a long list of things including low fuel pressure.

have u checked ur spark plug leads and spark plugs it all so be ur injectors

the fuel pump is going bad

try blowing out all the fule lines and changing the fule filters the lines may be blocked up also check the fule tank vent if this is blocked the pump cant **** fule from it

Does this happen occasionally after a stop? My 02' did this- brake light switch was sticking. I noticed it one night, after the car started chugging, I happened to look in the back window and saw the brake lights were illuminated for a few seconds even though i was totally on the acc.
This was a huge recall- lots of cars involved. Call a stealership and have them run the VIN # to see if you fall into the recall

Maybe the fuel u put to your gas tank had some water in it or your fuel filter needs to be changed. When last u changed your fuel filter

Have your check engine light scanned. Autozone will do it for free. Even if the engine light isn't actively on, it will tell you which codes have been triggered since the last clearing. Following your description, I would suspect damage to your exhaust is damaged. Most likely it is your catalytic converter. They are somewhat fragile due to their design and if you had it high centered on it, the honeycomb may have broken inside it. Just a guess, I'd say a replacement would cost you around $300-$500 installed.

i need to find my headlight relay can anyone help