90 Marqui, Loss of Power and rough gears

[lordmcdeath]

Hi all, me again.

My 1990 Grand Marqui (Canadian Model), has experienced a loss of power since my engine rebuild two years ago, and shifts rough between 35-45 miles of an hour (especially in overdrive).

It has recently started idling rough (sputters in idle and around 40-60 miles per hour).

I have replaced the (Idle Air Valve and Throttle Body Sensor), as well as cleaning out the throttle body. Please help. (will provide any additional info I can.)

[jimmytroanoke]

Originally Posted by lordmcdeath

Hi all, me again.

My 1990 Grand Marqui (Canadian Model), has experienced a loss of power since my engine rebuild two years ago, and shifts rough between 35-45 miles of an hour (especially in overdrive).

It has recently started idling rough (sputters in idle and around 40-60 miles per hour).

I have replaced the (Idle Air Valve and Throttle Body Sensor), as well as cleaning out the throttle body. Please help. (will provide any additional info I can.)

These cars are famous for ignition module (TFI) problems. Also check the base timing (the spout connector must be disconnected) and look for vacuum leaks. Don't rule out the obvious - fuel filter, plugs, wires, distributor cap and rotor, pcv,etc. If your engine is not running up to par, that will make your tranny act like it is ready to take a dump. Any Check engine lights? Codes? If it has never run well since the rebuild, the timing chain installation is suspect. Check your vacuum with a gage, and do a compression check to rule out base engine concerns.

[lordmcdeath]

Fuel Filter, Plugs, and Wires are only a couple months old. Took the car in for a tune up, didn't mention any codes (they were supposed to check), they were also supposed to check timing. (not that this means a huge amount).

No check engine lights.

Don't have a gage (any place you would recommend getting one)

By the way, I am hearing alot about the EGR. I have not cleaned that out, and don't know where exactly that is, could that be my problem?

Sorry if I am less than informed (my first car).

[BiggerJon]

from your quick post it sounds like you have torque converter shudder. do a full fluid/filter change.

stick with mercon fluid, not mercon v.

[lordmcdeath]

Oil Fuel/Filter or Transmition Fuel/Filter?