1987 Ford F150 XLT Lariat. 302, 5.0 automatic. 120k miles.
Hi, this is my first post and I wish I discovered this place last year when I got this truck. I changed a lot of the parts (Carfax said it sat for 10 years). I’ve never worked on a vehicle but wanted to learn and wanted an older truck.
Recently, it’s been stalling intermittently on the road. About 40 mph, flat ground. Probably a dozen instances. It’s unpredictable and there isn’t a pattern to it happening. New map sensor, tps, EGR, IAC valve, plugs and wires, pcv valve, o2 sensor, ignition coil, fuel pumps, fuel and air filters, tfi module (mechanic replaced the tfi, I did the others over the past year). A lot of the stalling symptoms seem to point towards the ignition switch, but I can’t seem to rule out the PCM, distributor, or pip sensor because symptoms match those to varying degrees.
When it stalls, I put it in park after coasting off the road and stop, turn the key, and it fires up without issue. My battery is a 24 (the previous owner had this in the truck, so I assumed it was correct and bought a new one of that size), but the true battery size is 65, I’ve since learned. Would that matter? Any insight and help would be greatly appreciated. My diagnostic knowledge is minimal, but I can replace parts and I can learn. Right now I’m afraid to drive it