Question about Ford F-150

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When driving on the highway somthing slips and forces the truck to slow down creating a jerking motion. no problems in lower gears

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Depending on how old the vehicle is,it may be a bad modulator valve on the transmission,or just a clogged vacum line to the modulator valve on the transmission. please be specific with year,make and model,but i gave you diagnostic for 89 trhu 99 for most models anyway,research what year,make model of your vehicle.some want to blow smoke and say bad electrical module.do your research 1st beause transmission shops are gonna say replace the transmission to replace the issue. beware the trans shops that use 'god' for logo.some are great,others are ****. ask for a list of customers,and stand in line at those shops for disgruntled customers.do your research,angie's list.com is one way of finding out who does great work. wish you the best.

Posted on Apr 01, 2011

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3 Answers

Can i drive in other gears on the highway besides being in drive...I have a 99 Lincoln continental? ?


you should use the highest gear possible to allow over drive to kick in, other gears will slow and limit the speed you can drive ,and stress the tranny

May 06, 2015 | 1999 Lincoln Continental

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What is wrong with my car when it jerks in drive


jerks when?

moving the shift lever. with hand?

moving car. in gear,name the gear, drive, L or reverse?

jerks from, 1 to 2nd gear, 2nd to 3? or ? (or when IT down shifts)

pretend we are blind (we are) and cant drive car,(hopeless) and

tell us exactly what works and dont work driving.

hot /cold engine, fast /slow/ accelerating/ decelerating, up hills and what gears.



if engine is hot, is your idle at 800 RPM parked, in park.

y/s

if not the idle controls are out of control and when you shift to drive

IT will jerk. this is an engine problem.

there are lots of other symptoms.

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1 Answer

Why the sudden jerking?


Fuel filter clogged and or impurities in the fuel system.faulty or incorrectly gapped spark plugs.Fault in fuel electrical system.Defective spark plug wires. Faulty emission system components.Vacuum leaks at the throttle body intake manifold or vacuum hoses. I would first look at the fuel inline filters it sounds like this is the likely problem.

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What you need to check is the transmission release bearing because if there is a clearance on the release bearing you will encounter this problem and also check the transmission oil.

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1 Answer

The car slipps or jerks in the low gears


you should go to a transmission guy they have computers that will find the problem and i think that its free... but i think that your transmission needs to be rebuilt, theres a lot that can go wrong with them things

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