A missaligned synchro can cause a P0301 it's possible but in my experience it also causes the vehicle to cut out at WOT around 4,000 RPM and then resume accelerating. I would suggest that you set the engine at TDC again and reinstall your synchro, also be sure not to install a Doorman synchro, they are known for failures soon after installation.


Troy.

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Old Truck - Restored 1987 Ranger XL Reg. Cab 2.3L 5-speed (Sold)
New Truck / Project - 1987 Ranger XLT Ext. Cab 2.3L 5-speed, 2wd