choppy acceleration= bad speed sensor?

[jsomogyi]

My acceleration is choppy sometimes, especially under heavy accel. The check engine light came on one day after hard acceleration , and the problem has persisted ever since. The mechanic gave me the following codes . Being firestone though, they couldnt really tell me much about the problem.

code 28 overheat

14 speed sensor

31 electronic controle module

21 - ignition coil

. Do you think that just replacing the speed sensor should do the trick? What do you think is happening? Note, the car has 230k miles.

[s13loverdrift1]

its not going to be your speed sensor because you can run without the signal reaching your ecu (thats the way I removed the governor). Im guessing it would be 21 or 31.

[shiro_neko]

check your grounds first zerothread/159907

Not sure whats happening but the speed sensor wont affect acceleration. Mine was choppy when the IACV wasnt set properly

[Kouki KAT]

code 28 overheat

How's your temp and coolant level. I overheated my poor car once, and it got crazy choppy acceleration.

[sx moneypit]

When you say choppy, is it a missfire,or is the car just falling on its face?

[shiro_neko]

ok..I thought I fixed my choppy accel but it seems to manifest during warm up. its choppy between 1800-2000rpm and mostly in low gears. if Im in 2nd gear and let the rpm drop to 1800rpm then step on the gas it chokes. I tested it with speed sensor on and off so Im pretty sure its not the speed sensor. I didnt have any codes though. I'll post back on what I'll find