ton van der sluijs

Haven't been here a while, but still owning my 1994 F150 Flareside with E4OD. Last 7 years, my engine was running like an old fart; engine stutters, high fuel consumption, and bad idling... Last summer I've found time to convert the cilinderheads to lpg ( hardened valveseats, Ferreavalves, and...valveseats from HD twincam( I'm co- owning a machineshop with motorcycle business) .. My truck runs smooth as silk right now, but...... Sometimes he goes out it's torque lock for 5 sec. Or a minute... Mostly when in cruise control.. I do suspect the TPS... Any suggestions? My best regards to Mike Mesky.. greetings from Amsterdam, the Netherlands..