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Why does my car runs sluggish, wont pick up speed, jerks during acceleration and all sparks plugs fire except two but all spark plugs are new. helppppp!!!
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Hi there, it could be a change of spark plugs will solve your problems. I'm driving one too but found that it jerked when accelerating. So I read up and presumed that the old plugs might be the cause. After changing new spark plugs, it doesn't jerk anymore.
What speed are you going when it chugs? It could be as simple as a bad spark plug or a spark plug wire/boot grounding out. When spark plug boots get old, the rubber cracks and lets voltage arc out the side and to the engine instead of through the plug. This will be most noticeable when trying to maintain a speed of over 40 mph, or under mild acceleration. The reason for being noticeable at this speed/acceleration level is that the transmission torque converter will be locked, transferring the vibration from any engine miss straight through to the wheels.
Could be several possibilities none of which I may be able to eliminate:
1. Tune-up! You are not getting enough spark or Fuel! Plug-wires may be cross-firing or bad ground from body to the engine - run a new ground wire to engine from battery or body-ground. 2. Replace fuel filter or do fuel pressure test to determine if f-pump is weak or lodged with corrosion or dirt particles. 3. replace plugs and wires and clean coil-pack ignition module (where plug wires originate from) use a brake-cleaner or throttle-body cleaner but be sure fumes are evaporated and dry before starting or spark could cause explosion from fumes. Oil on module could cause spark to jump. Do not run plug wires along each other or will jump spark, wires must be crossed once or twice for prevention of this.\ 4. check all vacuum lines around engine - a cracked vacuum line can cause a lot of problems. 5. injectors may be dirty or bad - easier to replace complete intake from scrap-yard then to pay $100.00 for new injectors each! 6. Coil-pack on ignition module could be cracked and may need to be replaced. These are only possibilities of course with the little info you provided. Hope this helps.
did you check the timing? the firing order.
does the engine rpm rev up high? if it does then check the transmsission for low on fluid or slipping.
check your catalytic converter for clogged up.
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