98 chevy blazer still shifts hard after new sensors? .?

Question

got a 98 chevy blazer that shifts hard to reverse and while driving into the next gear once about 40 it shifts fine, but after 40 the blazer starts accelerating up and down on its own, it does not do this if the blazer is on cruise control, i have replaced the Throttle position sensor with one from Autozone, i have also replaced the Vehicle speed sensor on the Tranny, There are no codes being brought up at all so i am just lost at this point... anyone have any clues.

Update:

this is the origional transmission but new motor in the vehicle but same motor size that came out. when we put the new motor in and got everything back together the Vehicle speed sensor was out completely..

Larry G · Accepted Answer

try getting your trans fluid, filter and pan gasket changed

mccuistion · Answer

I truthfully have the same situation with MAF. have been by way of 2 in 2 years, and verify Engine mild nonetheless comes on. Am questioning it it can be a leak someplace that's triggering the situation, no longer the MAF itself.

Jordan L · Answer

it probably needs a tune like a custom tune with someone that could fix how and when it shifts

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98 chevy blazer still shifts hard after new sensors? .?

3 Answers