1500 RPM Studder

[foureyedstang]

u should try replacing the pickup coil and thr mapsensor.

[foureyedstang]

map sensor could also cause hesitation

[Bwhitty799]

Still having this problem. Changed about everything know to man that would cause these problems but they are still here.

[David Claflin]

Did you ever try a vacuum gage on it to see what that shows?? I say that because it sounds like a leak, I know you've checked but some are hard to find but a vacuum gage will show it.
http://sbftech.com/index.php/topic,3020.0.html

[Bwhitty799]

I did a long time ago and it was fine if I recall correctly.  But I will give her another go and see what happens.

[Bwhitty799]

Checked vacuum the other night and it is fine.  Could the injectors be bad in this.  They are not very old but there is not much more that I can think of.

[quake101]

Checked vacuum the other night and it is fine.  Could the injectors be bad in this.  They are not very old but there is not much more that I can think of.

I guess it's possible, I had 1 bad injector in my stang when I put 24# injectors in it, it was running very very rich and was "bucking" at low RPMs. After I replaced the bad injector (and reset the computer) things went back to normal.

[Bwhitty799]

Never changed injectors. But last night I was listening to the car, and heard psst,psst coming somewhere around the intake.  I used another can of brake cleaner and no RPM rise.  This a sign of a bad injector???

[quake101]

So changing the injector fixed this?

[David Claflin]

So changing the injector fixed this?

That should show up in the codes or cylinder balance test

[quake101]

cylinder balance test?

[Bwhitty799]

Yes injector did fix this.

[David Claflin]

cylinder balance test?

http://sbftech.com/index.php/topic,2471.0.html