Your problem appears to be sensor-related. Could be one or more of these sensors: Throttle Position Sensor (TPS); Mass Airflow Sensor (MAF); Intake Air Temperature Sensor (IAT); Idle Air Control Sensor (IAC); or other sensor that affects engine performance. It would be wise to take your vehicle to an auto parts store that does free diagnostic scans (ie. AutoZone, Advance, O'Reilly's, etc.) to find which sensor is causing the problem.
If it's the same as the 1996 Ford Ranger , fuse # 33 is a 15 amp fuse for the High beam lamps
ford suck. go Chevy
I have a 2003 ford ranger v6 with 161000 miles and still run like new
In a 1996 Ford Ranger : In the fuse panel in the drivers end of the dash ( the fuse panel cover is visible with the drivers door open ) ( #4 ) is a 10 amp fuse for the left headlamp ( # 8 ) is a 10 amp fuse for the right headlamp and fog lamp system ( # 33 ) is a 15 amp fuse for the high beam lamps
your transmission is going
a belt slipping
Motorcraft high performance DOT 3
Running slow with high rpm is a sign of slippage. If the vehicle is a straight drive then the clutch is not grabbing and is slipping, if its an automatic then the transmission is slipping internally.
There are many online auto companies that will sell Ford Ranger accessories online but one that has high ratings is autoparts warehouse's site. They have a wide variety of parts.
The 1996 Ford F2 50 high pressure fuel pump is located inside of the gas tank. The high pressure fuel pump can be purchased from most auto-parts stores.
On the Ford 4.0 liter OHV , V6 engine the PCM starts cutting the fuel back at 5200 RPM in order to protect the engine when it is IN GEAR I believe it does it at 3000 RPM when there is no load on the engine ( park / neutral ) ( if that is what you mean by high speeds )
On a 2002 Ford Ranger : The check " gage " light comes on if : The engine coolant temperature is TOO HIGH The engine oil pressure is TOO LOW or The fuel gauge is at or near empty