If you are stuck without a timing light, you can try a dynamic tune (but then you need a tach meter to monitor the rpm's) Don't go throwing parts at it, you will be better off getting error codes from the ECU. Timing might still be off, then there's low compression, mis-gapped plugs, arcing in the distributor cap or the cap not sitting right. A bad temp sensor will cause a fuel delivery problem (stuck in open/closed loop) Combustion chambers might be carbon'd up as well.