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There could be a number of reasons for this. The transmission is on the same fuse as the mass air flow and O2 sensors, so a fault in any of those circuits will affect your transmission.
More information would be needed to know if you actually are in "limp-home mode", or if it's a symptom which is similar, but not caused for the same reasons. "Limp home mode" is caused either by a loss of electronics, which could be either a result of circuit failure, or the PCM shutting them off. But if it isn't doing that continually, the result could lie elsewhere.
First, check the fuse. With the vehicle warm, check the Transmission Fluid level. Then, go either to a shop or AutoZone, and have them scan the PCM for fault codes. Check for chafing in the lines coming out of the PCM.
After that, you can either buy a line pressure gauge or have a technician do it and hook it to the test port. At idle in the park, neutral, or overdrive positions, base pressure should be around 70 psi, and 140psi in reverse. Then you test the line pressure as you're driving. You want at least 190 psi for max pressure (215 - 230 is more desirable).
If your base pressure is low, then either your transmission or your pump is worn out. If base pressure is normal and max pressure is low, you need to check the EPC solenoid. If you're not getting at least 130 psi in reverse, your boost valve needs replacement.
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