Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 144; Flight Crew Type 4306
Troubleshooting
Aircraft Equipment Problem Less Severe; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft; Environment - Non Weather Related
Possible 5G interference event.Normal landing Runway 28R. Slowly; fully stowed thrust reversers after reversers reached idle reverser. ATC said to expedite across Runway 28L due to traffic on final. I advanced the thrust levers but the engines remained at idle thrust. ATC once again said to expedite. I tried once again to advance the thrust levers but the engines remained in idle. ATC had to issues go-around instructions to aircraft on final to Runway 28L. We coasted across Runway 28L and cleared the runway. We explained to ATC that we were having problems with the airplane. I raised the thrust reversers to the idle reverse detent and once again stowed the reversers. I was now able to produce forward thrust. I asked ATC for a phone number and called ATC once we parked at the gate. I spoke with ATC and explained the situation we were having with the airplane. The MAINT light was also illuminated on the overhead panel. We made all appropriate maintenance write ups and debriefed the Maintenance Technician on the issues.
After landing; we turned off on T and continued to roll. Tower cleared us across 28L and to D Taxiway with no delay. As the Captain pushed up the throttles both engines went into reverse and the takeoff warning horn went off. Other items also occurred including the flight number dropping off.  Traffic on final went around as we could not move fast enough to clear runway. Captain moved throttles and reverses a few times and finally was able to produce forward thrust.
Air carrier flight crew reported that the engines remained at idle when the thrust levers were advanced in order to taxi off the runway after landing and the takeoff warning horn sounded. After thrust reversers were re-stowed; engines responded normally.