1991 volvo slow when cold

check your fuel fillter or the fuel pump is going out or you might have to clean your injectors

Have you checked your fuel pressure?

Have a fuel pressure test run. Your car is 20 years old and if the fuel pump has never been replaced that is more than likely your problem.

PROBLEM WITH FUEL INJECTORS ELECTRICAL SYSTEM. COULD BE A FAULTY ECM.HAVE VECHICLE SCANNED WITH A SCANNER TO CHECK FOR A FAULTY ECM .

you are having a fuel delivery problem...and it could be caused by numerous things...such as a bad fuel pump, a bad cold sensor or warm up injector.  You haven't attempted to  solve any of these suspected faults...so take it to a mechanic for repair

try pushing the 4 wires on the radio supression relay into the connector, then try starting it... does it start, run, then die? those connectors ****, i've had the same prob. have you let it huff on some ether? (starting fluid) does it come to life? that would confirm weather or not it its fuel related. my 740 i was loosing voltage to my injectors 10 volts and under, causeing them to inttermittantly not fire, caused by a bad connection at that supression relay.

Check the fuel pump fuse and fuel pump relay first, before replacing the fuel pump. The fuses and relays are behind the the ash tray, The fuses are labelled. The relay is on the left side of the relay rack, closest to the big round bulb out sensor. But before that, how about pouring some gas line anti-freeze or fuel injector cleaner into the tank?

One of those relays supply power to the injectors. They fail, as well as the fuel pump relay, rpm sensor, and the main pump. Have you checked the trouble codes in the engine or ignition computers?

Bret
RepairPal.com

Had the exact same problem with my 240 wagon. There is a temperature sensor up near the manifold on the drivers side of the engine. This is not the temp sensor that feeds the dash gauge, but one that tells the engine control module whether you are starting hot or cold. Mine was cracked, so the engine computer would get a cold start signal even after the engine ran warm, and would flood. This can be a difficult problem to diagnose and an expensive one when mechanics start swapping parts. You cannot see this sensor, but you can feel it (when the block is cold, please) right under the exhaust manifiold. A replacement is about $80 plus labor. Even my very experienced Volvo mechanic overlooked it. But the car would start and run fine, then leave me stuck when I tried to restart it. After calling AAA for a tow, the temp sensor would reset, then the car would start normally. Cheers. The 240 is a great car - I ran mine up to 235,000 miles; now I have a 740 with the same engine.

google!! i found it!