bad injector

how do you no when you have a bad fuel injector? becasue my car shakes real bad at idle and i replace sparkplugs,wires and fuelfilter.

Is your check engine light on? If so what are the codes?

Is your check engine light on? If so what are the codes?
service engine soon light on which is the check engine light iam getting codes 300 and 303

It must be P0300=cylinder misfire detected(random), P0303=cylinder number 3 misfire. What year is this? How many miles you have on it? You may have to have the computer reset to clear the codes if you changed plugs because the computer will try to override the spark plug firingon its own. Its strange but that's how the thing works. My wifes 97 had a misfire on #4 so I changed plugs and wires and until I had the computer reset it still ran like s---. After resetting computer it runs great.

service engine soon light on which is the check engine light iam getting codes 300 and 303
its a 2000 and the it has 95,000 miles on it and i took it to autozone and they erase the codes in it but they came back on.

OK. Did you try running some injector cleaner through?

OK. Did you try running some injector cleaner through?
yes twice still shaking bad i took it to the shop and they did a lot of test and couldnt find why they said that it was not getting enough fire.

I've read on other forums in here that the random miss is a tech's worst nightmare. What kind of plugs did you put in? Since the code states its cylinder #3 you may want to take a look at that plug. If you have the v-6 I know its a bitch to get at.

I've read on other forums in here that the random miss is a tech's worst nightmare. What kind of plugs did you put in? Since the code states its cylinder #3 you may want to take a look at that plug. If you have the v-6 I know its a bitch to get at.
no i have the 4 cylinder i have ac delco 100,00 miles spark plugs came from dealer and i got the spark plug boots that go on them iam replacing the fuel pressure regulator now and i hope that work if you have any ideas please let me no

I am at a loss otherwise. If the plugs came pre-gapped make sure you check them just to be sure they were gapped right when the were manufactured.

fuel pressure regulator didint work

I am at a loss. If I read about anything or come across anything else that may help with the random miss code I'll pass it on otherwise it may be the injector (cylinder #3,P0303).

I am at a loss. If I read about anything or come across anything else that may help with the random miss code I'll pass it on otherwise it may be the injector (cylinder #3,P0303).
I just went trough this and it was the injector. I replaced coils, coil covern, fuel pressure regulater. it was my injector. You can move it to another one can the code should move as well.

While you are working on it, check the MAP sensor vacuum feed hose, for some reason mine was completly rotted, all other hoses were fine. Very odd due to the fact I have a '01 GA Quad 4, that hose should not be rotted yet. It caused severe idle problems and stalling.

The quick and easy way to narrow down either Coils or Injectors would be swap the Ignition Coils intead because that is very easy. If the misfire changes to another cylinder, then the Ignition Coil is the problem. If the misfire stays at the same cylinder, then the problem is with that injector.

i personally had the same problem, and it was an injector. when i put injector cleaner it made mine worse.