Why won't my truck speed up

Asked by Apr 14, 2017 at 07:39 PM about the 1998 Dodge Ram 1500 4 Dr Laramie SLT Extended Cab LB

Question type: Maintenance & Repair

I have a 1998 dodge ram 1500. Ive had it
for a month. It won't accelerate passed 40
mph. At first the issue was hust that it
shaked between 40-50 moh but now it
wont go passed 40. I need to fox this

3 Answers


Wouldn't be a plugged catalytic converter in the exhaust would it?

My catalytic converter does need to be replaced


If the engine seems to run fine, but holding back, the cat can do this. All you need to do is drive the truck, get it warmed up, park in a dark area and with the truck still running, look at the cat. it would be glowing orange if it is plugged up. This definitely would be the cause of the truck not able to accelerate. May have to have someone hold the gas pedal and idle it at like 2000 rpms also.

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