Rudy, newer remote controls are more sensitive to rf interference
because they are now transceivers instead of just transmitters. The
antenna and environment around the operator itself is essentially
unchanged but now the itty bitty antenna in the remote must also be a
receiver to negotiate an offset for rolling code security. this little
antenna is more susceptible to shielding, gain fluctuation and noise.
Your ignition wires are likely starting to break down and having their
effect on a marginal transmission. Try a new battery, also try
relocating the remote - remember that rf energy falls off at the
square of the distance so what you might consider a negligible 6 inch
offset in location appears to the receiver like 3 feet.