OK so ive been trying to fix this roblem for about 2 months now and im running out of patience. Car is a 1992 940 Turbo with roughly 156k on the clock.

About 2 months ago i had to replace the head gasket and turbo, i replaced the HG and the Turbo with a 15g at that time i also replaced the intake manifold gasket,Coolant temp sensor,vacc lines,plugs,wires,cap,rotor,timing belt,and exhaust manifold gaskets. Car ran fine for about a day then while driving it started to idle low and lack power then died. took about 45 min to restart then drove it to gf's house where i died again. after about 2 hours it started and i got it to her house(died down the street.) researched and replaced the crank position sensor,throttle position sensor and power stage. als replaced the fuel rail and injector o-rings since it looked a little out of whack and has seepage from #4 injector.

Replaced CPS took for a drive died 5 min down he road and had it towed again.

Finally had it towed home. ran a lot of tests using the ODb diagnosis system and found no coeds. IN test mode 2 for the sensor tests all come back ok. for test mode 3 all sensors and units click and or move.

Now after about a day of sitting it will start and idle fine , rev fine all the way to red line no problems or hesitation. after warming up a bit about 1/3 of the temp gauge it starts to sputter and idle low 400 or so lack all power and wont rev to save its life, and finally dies.

Im starting to be at a loss over what it could be since ive replaced a ot of stuff adn its none of those things. my last ideas are the fuel filter, thinking maybe it gets clogged after running for a few or the coil perhaps since i noticed when checking for spark its an orange spark instead of a blue/white spark. fuel pressure is fine reading 315kpa. compression is good reading 165 across the board. and the fuel pump relay wrks and has also recently been replaced.

any help you can offer is appreciated as this seems the foremost resource for viable information for volvos and i desperately need help! thanks in advance.