Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Good afternoon. I could use some help. I have a 1998 ford E350 5.4 v8 vehicle shutters when going around 30-35 mph in 4th gear with little throttle. If you let go of throttle it goes away. If you give it more throttle it goes away. Only code i have is p0420 stored. I removed the driveshaft and it seams fine. Carrier bearing is good. Tires are good. Any suggestions i would appreciate it. And if possible you can call me anytime 9092896994. Name is Jorge.
Sounds like possible torque converter shudder. You can monitor the data pid for converter lock up and see if the symptom aligns with converter clutch engagement. Usually tapping the brake pedal cancels converter operation, so if you can hold it in the sweet spot where the shitter is happening and tap the brake with your left foot and see if the shitter goes away. I have had very good luck with fluids friction modifiers like Shudder Fix to correct this issue, even if just temporarily
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