Hesitation

[devaughnhughes]

I changed the fuel pump and filter but I'm still getting hesitation around 30 to 40 mph. Could it be my injectors?

[rauder88]

Have you checked your plugs/coils? Could be bad coils.

[fastblackmerc]

Did you attempt any kind of problem determination before changing parts?

[Badass_forever]

dirty mass air flow sensor

[devaughnhughes]

Mass air flow new, plugs new how do I check coils?

[rauder88]

Unless you have an oscilloscope to check the pattern the easiest way is to swap them out with good known coils. No misfire codes?

[Gerry24]

If one coil is bad, change them all... Save yourself a headache later.

[champ1173]

You need a tune! I felt the same thing when I bought mine, and when I got a tune from Mo it disappeared.

[devaughnhughes]

Good Lookn champ any suggestions on a good shop to have it tuned and serviced in or near Dallas

[champ1173]

Look under "Forums" here. Go down to Supporting Vendors, n you'll see, "Mo's Speed Shop." If you have a hand held unit, (SCT) he could send a tune to your email, and you could just download it to your unit. If not, he could set you up w a tuner, n tune. I got mine from him, as well as many other members. He's good people!

[babbage]

Yes, ^^^ Mo's is good but get it running right before you put a tune in it.

Tips: Clean throttle body and upper intake use Seafoam, blast it. Clean IAC, and your TPS they are on the throttle body. Airfilter is new too I assume. If you have 10+ year old COPS id say it's time for a new set. How many miles?

If you only feel a buck/stumble at light throttle at 30-40 it could also be your EGR/DPFE sensor or transmission - possible but less likely.

[champ1173]

Yes, ^^^ Mo's is good but get it running right before you put a tune in it.

Tips: Clean throttle body and upper intake use Seafoam, blast it. Clean IAC, and your TPS they are on the throttle body. Airfilter is new too I assume. If you have 10+ year old COPS id say it's time for a new set. How many miles?

If you only feel a buck/stumble at light throttle at 30-40 it could also be your EGR/DPFE sensor or transmission - possible but less likely.

He said he's changed this, n cleaned that, n still has the stumble. It's because of the stock tune, n the crappy shifting schedule. Mine did the same exact thing being all stock, and I tried doing the same thing the OP is now doing. The tune fixed it for me.

[devaughnhughes]

Will do good Lookn fellas! Just tryna get her right!

[devaughnhughes]

Ok fellas I can't figure out how the water is getting in the passenger side rear of my car when it rains. Any ideas of how this is happening??

[RF Overlord]

Changed the thread title to more accurately reflect the OP's issue.

[camelgrundle]

Weatherstripping?

[1stMerc]

How long have you had the car and how many miles on her?

[champ1173]

Weatherstripping?

^^^^+1^^^^^

[devaughnhughes]

7 months ,131