1999 GMC Sonoma Questions

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I recently replaced my radiator including oil supply lines and it is now leaking oil at the connection of the top of the radiator. What could be the problem?
i need to get a new alternator for my sonoma, when i was ordering the part online, it asked me what amperage should i get, i have no clue what to get. any idea?
This is a 1999 GMC Sonoma 2.2 4cylinder engine,both of these quit working at the same time.
Truck stalled while driving... Got it towed home changed 1 coil pack due to orange/red spark. Changed crankshaft sencor get good spark ,gas and compression but still won't run even if I put gas in throttle body....eve...
I recently changed head gaskets, intake gaskets, and distributor. I set the #1 piston at TDC and set the rotor/dist to point at the 6 on the dis housing and when i start it, it idles perfect soon at you go to give it ...
have replaced purge valve and sensor, service engine light still comes on.
Its a v6 push button 4x4 1999 gmc sonoma 2 door. It only changes while driving especially after going up steep heels.when i let off gas then i hear the winding sound and have to push 4 high than 2wd button
The fuel filter has been checked , and it is getting fuel
i have spark i changed in jectors it still wont start gasi have but does not come out the injectors help
sounds like it may be coming from the fire wall. when this happens my brake petal pulsates and it will stop but, a lot slower than normal. Could it be a caliper binding up somehow? also, the ABS light will come on eve...
When the engine is fully warmed up the noise almost goes away! We have pulled the motor and dis-assembled, all wrist pins are a little loose but #3 isnt any worse than the other 3.Also all rod bearings look good, and ...
Code P0135 bank one sensor one. I changed the sensor on the driverside exaust and the same code keeps coming up. Do you think the sec air system is causing this problem because the only thing that stays incomplete whe...