[Rici13]

Hello everyone

I have a 1994 Silverado K1500, 120 K miles, V6 4.3L engine, manual trans, throtle body, new sparks, wires, cap distr, new air filter, just donw the oil change, pretty new exaust pipes, new O2 sensor, timing at 5 deg BTDC. When I start the car the idle speed jumps between 300-900 rpm, but the car still has somewhat power. As I start driving it, the car has power but the tach is still jumpy. When the car reaches operating temp at 195 deg the car loses power, I can hear a constant pop sound in the exaust and when I punch the gas the tach needle will not come down right away, it feels like it gets stuck.

If anyone has any suggestions on this, could it be some of the sensors conected with the emissions?
Thanks a lot everyone, Raz